Which of tye following are good are good OPSEC countermeasures?

Explanation:

OPSEC may be defined as the process of using a systematic method that is  used to protect, identify and control any critical information.

The function of OPSEC is to reduce vulnerability of the United States and other multinational forces from any successful adversary exploitation of the critical information.

The OPSEC countermeasures is used to prevent and protect the adversaries from getting detect an indicator and from the exploitation of a vulnerability.

The good OPSEC countermeasures may include modification of the operational as well as the administrative routines, the use of deception, cover and concealment,etc and also other steps which degrade the ability of the adversary to exploit the indicators of the critical information.