In the design protocol of the critical section problem, each process must ask permission to enter the critical section in ______ code; it then executes in the critical section; once it finishes executing in the critical section it enters the ____ code. The process then enters the ____ code.

In critical section problem, the general structure of a process is:

Entry Section
Critical Section
Exit Section
Remainder Section

Entry section:

A process asks permission to enter the critical section.

Critical section:

The process executes the shared resource code.

Exit section:

The process releases permission or lock.

Remainder section:

The process executes the remaining code.

So, the correct order is:

entry section, exit section, remainder section