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