Which two key and block sizes are valid for AES? (Choose two.)

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Which two key and block sizes are valid for AES? (Choose two.)
A . 64-bit block size, 112-bit key length
B . 64-bit block size, 168-bit key length
C . 128-bit block size, 192-bit key length
D . 128-bit block size, 256-bit key length
E . 192-bit block size, 256-bit key length

Answer: C D