Eight identical slips of paper, each containing one number from one to eight, inclusive, are mixed up inside a bag. subset a of the sample space represents the complement of the event in which the number 6 is drawn from the bag.

which shows subset a?

a = {6}
a = {1, 3, 5, 7}
a = {1, 2, 3, 4, 5, 7, 8}
a = {1, 2, 3, 4, 5, 6, 7, 8}