The establishment of R.A. No. 6713, known as the Code of Conduct and Ethical Standards for Public Officials and Employees, primarily serves to set clear guidelines for ethical behavior among public servants. This law was introduced to promote a high standard of ethics and integrity in public service, ensuring that public officials and employees act in accordance with the principles of public accountability, professionalism, and ethical conduct. The underlying purpose is to create a framework that not only guides the actions of public officials but also instills trust among citizens in the governance process. By articulating specific standards of behavior, the law helps to prevent corruption, abuse of power, and any actions that could undermine public confidence in governmental institutions. The other options do not capture the fundamental objective of this legislation. While rewarding public officials and enhancing benefits may be aspects of civil service, they are not the primary focus of R.A. No. 6713. Additionally, limiting the authority of local government units does not align with the core goals of establishing ethical standards for public service. Instead, the law emphasizes accountability and ethical responsibilities to enhance public trust and integrity within the government.