Which of the following are valid key sizes for AES (choose three)?

Correct answers: 128, 192, 256

https://en.wikipedia.org/wiki/Advanced_Encryption_Standard

The Advanced Encryption Standard (AES), also known by its original name Rijndael, is a specification

for the encryption of electronic data established by the U.S. National Institute of Standards and

Technology (NIST) in 2001.

AES is a subset of the Rijndael block cipher developed by two Belgian cryptographers, Vincent Rijmen

and Joan Daemen, who submitted a proposal to NIST during the AES selection process. Rijndael is a

family of ciphers with different key and block sizes. For AES, NIST selected three members of the

Rijndael family, each with a block size of 128 bits, but three different key lengths: 128, 192 and 256

bits.