Which answer choice includes all solutions to the inequality and identifies which interval(s) contain viable
completion times of machine 1?
(0.3) U (9,18); both contain viable times for machine 1
(0.3] U (9,18]; only (9,18] contains viable times for machine 1
(-0,0) U(3,9U(18,co); no interval contains viable times for machine 1
• (-0,0) U(3,9) U(18,co); but only [18,0) contains viable times for machine 1