USPS Error Detection Test

Which of the following errors is the most common reason for mail being returned as 'Insufficient Address' by the USPS?

Using a 5-digit ZIP code instead of the full ZIP+4. Missing or incorrect apartment, suite, or unit number. Abbreviating the street type (e.g., 'ST' instead of 'STREET'). The absence of a recipient's middle initial.

Correct Answer:

Missing or incorrect apartment, suite, or unit number.

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