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For any encryption algorithm the ciphertext is

$ciphertext=f(plaintext,key)$

i.e ciphertext is function of key and plaintext and is not dependent on the userdetails, therefore D is the correct option

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The Boolean expression $AB+A \overline{B}+\overline{A}C+AC$ is unaffected by the value of the Boolean variable _________.$A$$B$$C$$A, B$ and $C$