Most large-scale computer systems maintain at least three program libraries: production library (for running

programs); source code library (maintains original source coding); and test library (for programs which are being changed). Which of the following statements is correct regarding the implementation of sound controls over computer program libraries?

A. Only the program librarian should be allowed to make changes to the production library.

B. The computer operator should have access to both the production library and the source code library to assist in diagnosing computer crashes.

C. Users should have access to the test library to determine whether all changes are properly made.

D. Only programmers should have access to the production library.