RCCP, Rough-Cut Capacity Planning, is a mid-term planning technique used to verify whether the capacities of major resources can support the Master Production Schedule. It works with rough estimates of capacity for bottleneck resources—such as machines, labor, and shifts—and compares them to the workload planned in the MPS across time buckets. Because it operates at a broader, less detailed level than shop-floor scheduling, its horizon is intermediate, not long-range capital planning and not day-to-day scheduling. It serves as a feasibility check before committing to detailed scheduling, helping you spot capacity gaps early and adjust the MPS or capacity levels accordingly. In short, RCCP ensures the master plan is realistic about what the manufacturing system can handle, rather than replacing detailed planning or shifting to long-range decisions.

Safety stock is a buffer against uncertainty in demand during the replenishment lead time. The common way to quantify it is to multiply the z-score for the desired service level by the standard deviation of demand during lead time, giving SS = z × σDL. The z value determines how confident you want to be about avoiding a stockout, while σDL represents how much demand can vary over the lead time. If lead time is fixed, σDL reflects the variability in demand per period across that lead time (often σDL = σ × sqrt(L)). Using just the average demand ignores variability and can lead to stockouts, while lead-time demand (L × D) is the expected consumption during lead time, not the safety buffer.

Cycle counting is an ongoing and selective practice where a subset of inventory items is counted on a rotating schedule, typically focusing on high-value or high-risk items, to maintain accuracy continuously. Annual inventory is a full physical count performed once per year to verify quantities and value for financial reporting. This combination captures the reality that cycle counts run throughout the year and are targeted, while an annual inventory provides a complete snapshot for accounting. The other statements misstate timing and scope: cycle counting is not limited to year-end, and annual inventory is not updated in real-time or done as random sampling.

The main concept is that supply chain management aims to deliver the right products to customers when they want them while keeping overall costs under control. The best answer captures this balance by highlighting both higher customer service (better availability and on-time fulfillment) and lower costs tied to inventory and operating expenses. In practice, SCM seeks to meet demand efficiently, using minimal but sufficient inventory and streamlined operations so service levels improve without inflating total costs. Maximizing production while ignoring service levels would likely raise costs and leave demand unsatisfied, harming customer satisfaction. Increasing supplier count without improving service adds complexity and procurement costs without tangible benefit. Minimizing transportation costs at the expense of inventory ignores the trade-offs, potentially increasing stockouts or safety stock needs and harming service.