4. Consider the following snapshot of a system with five processes (ie., P1, P2, P3, p4, and P5) and four resource types (i.e., A, B, C, and D): Available (A,B,C,D) (0,0,1,X) P1 P2 Allocation (A,B,C,D) (2,1,1,0) (2,2,0,0) (1,0,1,1) (0,4,2,2) (0,2,5,2) Max (A,B,C,D) (4,1,1,2) (3,5,0,1) (1,0,1,1) (0,4,4,2) (2,2,5,6) P3 P4 P5 Please answer the following questions based on the system snapshot provided above. (15%) (a) Show the content of the matrix Need. (5%) (b) If X=9, find out whether (P3, P4, P2, P5, P1) is a safe sequence or not. Explain your answer to receive full credit. (5%) (c) What is the smallest value of X to keep the system in a safe state? Explain your answer to receive full credit. (5%)