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 3 2 1 4 2 2 2 2 PA PB PC PD 1 3 2 1 3 2 1 0 Claim Matrix R1 R2 R3 R4 54 5 4 Resource Vector Ri R2 R3 R4 1 1 1 2 PA PB 1 1 1 2 0 PC PD 1 0 2 0 0 0 1 Allocation Matrix (a) Find the available vector [2 marks] (b) Is the system in in state-safe? Explain your answer. [3 marks] (c) Using the initial current state, if PD is asking for 1 additional unit of R2, does it safe to grant PD request? [4 marks]