For each set of values below, select YES if the set of values is a possible bootstrap sample from the sample {2, 7, 12, 9, 18}. Select NO otherwise.

(a) {2, 2, 2, 2, 2} [ Select ] ["No", "Yes"]

(b) {12, 7, 7, 9, 18} [ Select ] ["No", "Yes"]

(c) {18, 7, 2, 9} [ Select ] ["No", "Yes"]

(d) {18, 18, 18, 18} [ Select ] ["No", "Yes"]