Deadlocks & safe state

Consider the following snapshot of a system:

Process Allocation Max Available

A B C D ABCD ABCD

P$0302142421000$

P$101010222$

P$212003210$

P$301121112$

P$400111021$

a$)$ What is the content of the matrix Need?

Process Need

A B C D

P$0$

P$1$

P$2$

P$3$

P$4$

b$)$ Is the system in a safe state? If yes, give a safe sequence of processes. If not, explain why the system is not in a safe state.

c$)$ If a request from process P$4$ arrives for $(1,0,0,0),$ can the request be granted immediately? Please state the reason.