What is the ‘necessary human being’ concept?

What is the ‘necessary human being’ concept?
A . The particular characteristics and reactions required at a security post necessitate human capabilities
B. Dependant characteristics of a human operating a security system
C. The particular characteristics and reactions required at a security post that do not necessitate human capabilities
D. The particular characteristics and reactions required at a security post that can be recovered and upgraded by mechanical means

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Answer: A