Consider the following statements:
FCFS (First come, first Served)
Last, Come Last Serve (LCFS)
Earliest Due date (EDD)
Shortest Processing Time (SPT)
Longest Processing Time (LPT)
Critical ratio (CR)
Slack Per remaining Operation (S/RO)
Which of the above is (are) not a priority rule?
EDD, CR and LPT
CR
LCFS and LPT
S/RO and CR
All of the above are priority rules