72.Which of the following statements is incorrect?
a.In SQL Server databases, loginless user is a database user that is not associated to any SQL Server login account.
b.Symmetric key encryption algorithm uses the same cryptographic keys for both encryption and decryption.
c.Hash algorithm is a one-way encryption algorithm that allows us to encrypt data but does not allow decryption.
d.Authentication is granting of a privilege that enables users to have legitimate access to a system's object or resources.