單項選擇題

What are two types of ciphers?加密的兩種方式是?()

A.Transposition and Permutation.換位和置換
B.Substitution and Replacement.替代和置換
C.Transposition and Substitution.換位和替代
D.Transposition and Shift.換位和轉(zhuǎn)換

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