What are some of the functions of the computing center management system (CCMS)? There are 3 correct answers to this question.

What are some of the functions of the computing center management system (CCMS)? There are 3 correct answers to this question.
A . Background processing and job monitoring (transaction SM37)
B . Sending system messages to null users (transaction SM02)
C . Tuning of the main memory areas (transaction ST02)
D . Managing lock entries in the lock table (transaction SM12)

Answer: A,B,D