Which of the following presents the STRONGEST access control?

MAC enforces access based on security labels (such as classifications) assigned to subjects and objects by the system, and individual users have no ability to override or delegate these permissions - only administrators and the OS enforce them. This makes MAC the strongest model as it removes discretion from users entirely, preventing privilege abuse or accidental permission grants.

TACACS (Terminal Access Controller Access Control System) is an authentication and authorization protocol for network device access, not a general access control model comparable to MAC, DAC, or RBAC.

DAC (Discretionary Access Control) allows resource owners to set permissions at their discretion, making it weaker than MAC because users can inadvertently or intentionally grant excessive access.

RBAC (Role-Based Access Control) assigns permissions based on job roles and is more flexible than MAC but less strict, as roles can be broadly defined and users may accumulate permissions across multiple roles.