What does OPM stand for?

The correct answer is the Office of Personnel Management, commonly referred to as OPM. This U.S. government agency is responsible for managing the civil service of the federal government. OPM's primary functions include overseeing the recruitment, hiring, benefits, and training of federal employees. It plays a crucial role in setting policies and regulations relating to human resources management across various federal agencies, ensuring that the workforce is effective, diverse, and well-supported.

Understanding the functions of OPM helps to underscore its importance in maintaining a capable and efficient federal workforce, which is key to the functioning of government operations. The other options, while they include the term "personnel management" or similar phrases, do not accurately represent the official title or purpose of the agency related to human resources at the federal level.