If S works on the 1st day of the job, which of the following are true? I. Only T or U can work on the 2nd day II. T,U or R co...

If S works on the 1st day of the job, which of the following are true? I. Only T or U can work on the 2nd day II. T,U or R could work on the 2nd day III. R,S or W could work on the 3rd day