6. Which description about the block cipher operational modes is NOT correct? (5 points) A. A block cipher in ECB mode generates identical ciphertext blocks for identical plaintext blocks. B. A

block cipher in CBC mode can encrypt each block in parallel. C. In CBC mode, an error in a ciphertext block can affect the decrypted plaintext of the next ciphertext block. D. Both the OFB and CFB modes transform block ciphers to stream ciphers.