With each of the following encryption modes:

A$.$ ECB

B$.$ Randomized ECB

C$.$ CBC

D$.$ CTR

Explain your answer for

State whether multiple processors can be used in parallel to encrypt a large file.

which blocks in an encrypted file need to be read in order to decrypt block n$?$

Suppose someone is attempting to decrypt a file, but block n is corrupted. How much of the plaintext will be corrupted in each of the following modes?