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What does cost effectiveness mean in terms of military requirements?

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What does cost effectiveness mean in terms of military requirements?

(a) Backward compatibility

(b) Cheap replacement of existing radios

(c) Futuristic design

(d) Fast replacement of existing radios

The question was asked during an online interview.

My question is based upon Architecture Evolution topic in chapter Architecture Evolution of Cognitive Radio

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Correct option is (a) Backward compatibility

Best explanation: Cost effectiveness means the new design must be able to communicate with previous versions of radios. The design must be compatible with radios which are meeting the end of their lifetime.

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