In kerberos, the authentication server has plain text passwords, and the initial encryption is a hash of the password(KA(Alice)). This is insecure. If we change the storage format, we may achiece better security. Explain how the following changes affect security:

a) What if the passwords were stored in hash form?

b) What if the passwords are stores as hash of password and they key is hash of hash of password

C) What if the passwords are stores as hash of hash of password and they key is hash of hash of password