What Is the Value of Set S After the Following

Multiple Choice

What is the value of set S after the following operations?
S = set([ 3, 9, 6 ])
S.add(6)
S.add(4)
S.remove(6)

A) {3 9 6 4}
B) {3 9 4}
C) {3 9 6}
D) {3 4 6 9}