Choice "C" is correct. Maintaining current, off-site copies of critical data and program files is a fundamental part of any disaster recovery plan.
Choice "a" is incorrect. An auxiliary power supply would prevent loss of power and possible loss of data.
Choice "b" is incorrect. This is a distractor. Decipherable password lists should not be maintained.
Choice "d" is incorrect. Using data encryption would prevent unauthorized use of information even if data access controls failed.
