4. Assuming we are preventing deadlocks and given the following system snapshot: Allocation A B D PO 1 2 0 O O P1 0 1 5 P2 2. 1 0 0 P3 0 3 1 0 P4 1 1 1 O MAX A B D PO 3 3 4 0 P1 2 2 3 5 P2 2 1 2 1 P3 1 3 1 1 P4 4 2 1 3 Available A B D 1 0 1 3 Confirm that the system is in a safe state by giving the process sequence. The answer should be formatted where each process is on a separate line. For instance if the sequence was then the given answer will be: P2 P1 P3 P4 PO