An example of poly-alphabetic substitution is
(C) Caesar cipher
(D) Vigenere cipher
Explanation: Using more than one alphabet and switching between them systematically to encrypt data is called a polyalphabetic substitution cipher. The Vigenere cipher is a method of encrypting alphabetic text by using a series of interwoven Caesar ciphers based on the letters of a keyword. It is a form of polyalphabetic substitution.
So, option (D) is correct.
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