Suppose there are four processes in execution with $12$ instances of a Resource R in a system. The maximum need of each process and current allocation are given below:

Process

Max. need

Allocation

P$1$

$8$

$3$

P$2$

$9$

$4$

$3$

$5$

$2$

P$4$

$3$

$1$

With reference to current allocation, is system safe? If so$,$ what is the safe sequence $?$

O b$.$ No

O c$.$ Yes, PaPiP$3$P$4$

Od$.$ Yes, P$,$P$2$P$3$P$4$