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Which of these assures that one person acting alone cannot compromise security on his own?
principle of least privileges
mandatory vacations
separation of duties
All of these
EDIT: Changed answer to separation of duties. Mandatory vacations offer deterrence because it provides opportunities to catch misuse. Least privilege reduces the number of users who can compromise security, but every environment must have some highly privileged users so it is an incomplete solution. Thus, neither of these can assure security. Properly implemented, separation of duties can make it impossible for a user to compromise the environment without assistance (collusion).
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