AWS Key Management Service uses the Advanced Encryption Standard $($AES$)$ algorithm for Server$-$Side Encryption. Which of the following statements about AES are true?

AES encrypts $128-$bit plaintext to produce $128-$bit ciphertext.

AES Substitution transformation substitutes each $4$ bits of a matrix with $4$ bits.

AES has a fixed key size.

AES MixColumn transformation is built on GF$(2^8).$

AES decryption algorithm is different from AES encryption algorithm.

AES MixColumn transformation may use any constant matrix.

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