34. Substitution boxes (S-Boxes) are often used in block encryption algorithms, which of the following is a correct description of a S-Box? O S-Boxes substitute one unit of data for another to create a non-linear mapping between ciphertext and plaintext. They typically operate on units of data around the same size as the blocksize (64-256 bits). O S-Boxes substitute one unit of data for another to create a linear mapping between ciphertext and plaintext. They typically operate on small units of data (-8bits) O S-Boxes substitute one unit of data for another to create a non-linear mapping between ciphertext and plaintext. They typically operate on small units of data (-8bits) O S-Boxes substitute one unit of data for another to create a linear mapping between ciphertext and plaintext. They typically operate on units of data around the same size as the blocksize (64-256 bits)