Consider the following statements :
P : A page fault occurs when the required page is not available in the main memory.
Q : There exists a situation that, there is no space available in the main memory.
Which of the following is true ?‘
(A) Both P and Q are true, and Q is also a reason for P
(B) Both P and Q are true, and Q is not reason for P
(C) P is false but Q is true
(D) Both P and Q are false