Which of the following is true of using a DoD Public Key Infrastructure (PKI) token?

Using a DoD Public Key Infrastructure (PKI) token while actively engaged in a PKI-required task ensures that only the authorized user has access during sensitive operations, which is crucial for maintaining security and integrity. This practice minimizes the risk of unauthorized access to the token, as it is not left connected to a system unnecessarily. When the token is only connected during active use, it reduces the chances of exposure to potential cyber threats or misuse.

Other options, while they may highlight important considerations in a general context, do not align with the best practices for PKI token usage. For instance, keeping a PKI token connected at all times could lead to unauthorized access, while allowing it to be used by anyone compromises the security measures the PKI token is designed to enforce. Additionally, while secure storage is important, requiring it to be stored in a secure vault at all times might not be practical for active users, who need the token readily available during their duties.