Why are input/output control mechanisms necessary for a companys operations security?

A.
To ensure that data is encrypted/decrypted correctly

B.
To verify the accuracy of data entered into or generated out of a system

C.
To observe and detect unauthorized activities

D.
To capture system activities, including possible security violations

Explanation:
Input/output controls must be in place that verify the accuracy of
data being entered into or generated out of a system and/or its devices.