Which of the following is not true with respect to deadlock prevention and deadlock avoidance schemes?

In deadlock avoidance, the request for resources is always granted if the resulting state is safe.

Deadlock avoidance requires knowledge of resources requirements a priori. $0$

In deadlock prevention, the request for resources is always granted if the resulting state is safe.

Deadlock prevention is more restrictive than deadlock avoidance.

A process is in the state when it is in main memory and awaiting an event.

Ready $.$a $$

Blocked $.$b $$

Blocked$/$Suspend $.$c

Ready$/$Suspend $.$d $.$