Prepare for the DoD Government Purchase Card exam. Study with multiple-choice questions, each with hints and explanations. Boost your readiness for the test!

To access the Procurement Card Online System (PCOLS), having a Common Access Card (CAC) is essential as it serves as the primary method of authentication for government personnel. The CAC is a secure form of identification that enables users to log into government systems, ensuring that only authorized personnel can access sensitive information and resources.

The use of a CAC not only provides a secure means of access but also helps the Department of Defense maintain robust cybersecurity protocols. This requirement aligns with the government's directives on secure access to electronic systems, emphasizing the necessity of employing multi-factor authentication to protect classified and sensitive data.

While a user ID and password, access to a government computer, and approval from a supervisor may be relevant in other contexts, the CAC specifically stands out as the mandatory credential for accessing PCOLS due to its role in verifying the identity of users in a secure manner.