Pease answer the following questions. Please give a brief explanation of each answer. Please respond within 8 hours.

Verification that the credentials of a user or other system entity are valid is called Question options: adequacy. authentication. audit. In password cracking, the exponential wall means that Question options: the number of exponents that can be tested is limited mathematically, a string exponent is needed in the cryptographic key used to store passwords, the time for a brute force attach increases exponentially with the password length. An important principle of mandatory access control is Question options: access control is mandatory at all times, information flows up, not down, all information must be kept secure