What will be the cipher text produced by the following cipher function for the plain text ISRO with key k =7. [Consider ‘A’ = 0, ‘B’ = 1, …….’Z’ = 25]. Ck(M) = (kM + 13) mod 26
(A) RJCH
(B) QIBG
(C) GQPM
(D) XPIN

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