Question: AWS Key Management Service uses the Advanced Encryption Standard ( AES ) algorithm for Server - Side Encryption. Which of the following statements about AES

AWS Key Management Service uses the Advanced Encryption Standard (AES) algorithm for Server-Side Encryption. Which of the following statements about AES are not true?
AES decryption algorithm is different from AES encryption algorithm.
AES has two options for key size.
AES MixColumn transformation uses an inversible constant matrix.
AES MixColumn transformation is built on GF(2^4).
AES Substitution transformation substitutes 8 bits of a matrix with 8 bits.
AES encrypts 256-bit plaintext to produce 256-bit ciphertext.

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