What is the number of forwarding arrows required for the below program for a 5 stage pipeline processor with forwarding employed. SUB $s1,$s2, $s3 LW $s4, 4($s1) on MW LW $s2, 0($s2) AND $54, $s1, $54 WW SW $54, O($s1) Select one: O a. 2 O b. 3 Oc. 1 O d. 4 O e. 0