Explanation/Reference:
Explanation:
Typical security administrator functions may include the following:
Setting user clearances, initial passwords, and other security characteristics for new users

Changing security profiles for existing users

Setting or changing file sensitivity labels

Setting the security characteristics of devices and communications channels

Reviewing audit data

Incorrect Answers:
B: System operators provide day-to-day operations of computer systems. They do not perform the tasks listed in the question.
C: Data owners are primarily responsible for determining the data's sensitivity or classification levels. They can also be responsible for maintaining the information's accuracy and integrity. They do not perform the tasks listed in the question.
D: Data custodians are delegated the responsibility of protecting data by its owner. They do not perform the tasks listed in the question.
References:
Krutz, Ronald L. and Russel Dean Vines, The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, New York, 2001, p. 211