While rarely enforced, mandatory vacation policies are effective at uncovering:

A.
Help desk technicians with oversight by multiple supervisors and detailed quality control
systems.

B.
Collusion between two employees who perform the same business function.

C.
Acts of incompetence by a systems engineer designing complex architectures as a member of
a team.

D.
Acts of gross negligence on the part of system administrators with unfettered access to system
and no oversight.