The total number of keys required for a set of n individuals to be able to communicate with each other using secret key and public key crypto-systems, respectively are:
(A) n(n-1) and 2n
(B) 2n and ((n(n - 1))/2)
(C) ((n(n - 1))/2) and 2n
(D) ((n(n - 1))/2) and n
(A) n(n-1) and 2n
(B) 2n and ((n(n - 1))/2)
(C) ((n(n - 1))/2) and 2n
(D) ((n(n - 1))/2) and n
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