The ability to do something with a computer resource can be explicitly enabled or restricted
through:

A.
Physical and system-based controls.

B.
Theoretical and system-based controls.

C.
Mental and system-based controls.

D.
Physical and trap-based controls.

Explanation:
Access is the ability to do something with a computer resource (e.g., use, change, or view). Access
control is the means by which the ability is explicitly enabled or restricted in some way (Usually
through physical and system-based controls). Computer-based access controls can prescribe not
only who or what process may have access to a specific system resource, but also the type of access
that is permitted. These controls may be implemented in the computer system or in external
devices.