Mark the TRUE sentence regarding the Access Control Matrix

Question

Mark the  TRUE  sentence regarding the  Access Control Matrix

Accepted Answer

it is an abstract model (it is not implemented as it is)

Answer

it is implemented as the access control system in operating systems.

Answer

it is implemented as the access control system to provide Role-based Access Control (RBAC).

Answer

it is implemented as the access control system in firewalls.

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