Five jobs are waiting for processing through two work centres. Their processing time (in minutes) at each work centre is contained in the table below. Each job requires work centre Sigma before work centre Delta. According to Johnson's rule, what sequence of jobs will minimize the completion time for all jobs?

Job	Sigma	Delta
R	40	10
S	25	30
T	50	20
U	35	35
V	55	15

	RSTUV
	SVTRU
	SUTVR
	VRUST
	SUVTR