Which statement is accurate regarding the process of granting and revoking permission levels?

The statement that a DTA (Data Transfer Agent) must have a permission level in order to grant or revoke that permission level is accurate. This is because permission management typically involves a hierarchical structure where only users or agents with certain rights can assign or remove those rights. A DTA must hold the relevant permission level themselves to ensure that they possess the authority needed to modify permissions for other users or agents effectively. This process helps to maintain security and integrity within the system, ensuring that permission changes are made by qualified individuals who understand the implications of those changes.

The other choices present inaccuracies about how permission levels function in a system; for example, unrestricted revocation of permission levels could lead to significant security vulnerabilities. Similarly, changing permission levels without approval undermines the governance of data access, and limiting visibility of permission levels only to administrators could hinder necessary transparency in user roles and rights assignment.