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0. Let P, C, K denote plaintext space, ciphertext space and key space respectively. In Shift Cipher P = C = K = Z26. For 0 ≤ k ≤ 25 encryption function ek is defined by ek(x) = ______ mod 26 and decrypt fuction dk is defined by dk(x) = ____ mod 26.
(x + k), (x - k)
(-x + k), (x - k)
(x + k), (-x - k)
(-x - k), (x - k)
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