Concept:DAC and MAC are two standard access control models used in computer security to manage permissions.
Explanation:DAC stands for Discretionary Access Control.
In DAC, the owner of a resource decides who can access it and with what permissions.
MAC stands for Mandatory Access Control.
In MAC, a central authority enforces access rules using security labels and policies.
DAC gives flexibility to resource owners, while MAC provides stricter, policy-based control.
MAC is preferred in high-security systems; DAC is common in general-purpose systems.
Therefore, the correct expansion of DAC is Discretionary Access Control.
The correct expansion of MAC is Mandatory Access Control.
Answer:The long form of DAC and MAC is Discretionary Access Control and Mandatory Access Control, which is Option C.