In a multi$-$programming environment:

Question $33$Select one:

a$.$

Multiple files are open at the same time

b$.$

Multiple programs are running in the CPU at the same time

c$.$

Multiple processes are active in main memory at the same time

d$.$

Multiple processors are running in the computer at the same time

e$.$

$(1)$ Multiple users are using a certain computer $($server$)$ at the same time