Alice sent Bob a secure message which is encrypted with AES in ECB model with a shared key known by the two of them. The message is short and has the size of one AES block. If one bit in the ciphertext is altered during transmission from alice to bob, which of the following is true: a$)$ since decryptioon is reversible, bob can still decrpyt the message and retrieve the original message b$)$ after decryption, bob will get a message that is only one bit different from the original message c$)$ even if only $1$ bit is modified, output of decryption resutls in a random message and bob will not be able to retrieve the original message from alice d$)$ because only $1$ bit is modified, after decryptipon, bob will get a message that is very similar to the original message.