What is the main advantage of using a mandatory access control (MAC) model instead of a discretionary access control (DAC) model?

What is the main advantage of using a mandatory access control (MAC) model instead of a discretionary access control (DAC) model?
A . MAC is more secure because the operating system ensures security policy compliance.
B . MAC is more secure because the data owner can decide which user can get access, thus providing more granular access.
C . MAC is more secure because permissions are assigned based on roles.
D . MAC is better because it is easier to implement.

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Answer: A