Question

If a process is executing in its critical section, then no other processes can be executing in their critical section. This condition is called

Answer 1

If a process is executing in its critical section ,then no other processes can be executing in their critical section then this condition is called mutual exclusion

Mutual exclusion stops access from a  shared source simultaneously .This process is basically used in  critical section  and also used in concurrent programming here various threads access a shared resource.