A loader is a program that places a program a user wishes to run into main memory. Given how the loader works, at which one of these points does a loader perform its wob$)$ rk$?$

a$)$ as a program is being compiled or assembled

b$)$ after the user requests to run the program but before the program actually runs

c$)$ as a program is running, and as each procedure$/$function of the program has its stack frame placed on the stack

d$)$ before a program is compiled or assembled