There are 4 processes (P1. P2, P3 and P4) and 4 resources (R1, R2, R3 and R4) in the system as shown in the figure below. R1 R2 R3 R4 PA 3 2 1 4 PB 2 2 2 2 1 3 2 1 PC PD 3 2 1 0 Ri R2 R3 R4 Claim Matrix 5 4 5 4 Resource Vector Ri R2 R3 R4 1 1 1 2 1 1 1 2 PA PB PC PD 1 2 0 0 1 0 0 0 Allocation Matrix (a) Find the available vector (b) Is the system in in state-safe? Explain your answer. (c) Using the initial current state, if PD is asking for 1 additional unit of R2, does it safe to grant PD request