OR and AND operations such as a student may graduate if they have taken the right classes AND obtained good grades happen in the ________ stage

Utility programs help to perform maintenance, correct problems, merge and sort sets of data, keep track of computer jobs, and compress data files.

Answer the following statement true (T) or false (F)

A ____ is a representation of the system being studied, which we claim behaves much like the original.

A. problem B. concept C. replica D. model