List the Set in Roster Form

Multiple Choice

List the set in roster form.
-S = {x| x is a whole number less than 6}

A) {1, 2, 3, 4, 5, 6}
B) {1, 2, 3, 4, 5}
C) {0, 1, 2, 3, 4, 5}
D) {0, 1, 2, 3, 4, 5, 6}