Which of the following statement is/are true?

statement 1:

If the execution and I/O of an individual process can be overlapped, the process will have decreased response time.

statement 2:

A condition variable is a data structure that can only appear within a monitor.

statement 3:

Once a process attempts to enter its critical section, then it cannot be forced to wait for more than a bounded number of other processes to enter the critical section before it is allowed to do so.