Three sets are given below:
= {3, 7, 12, 18, 19}
= {12, 18, 21, 25}
= {3, 7, 23, 25}
What is ∪ ( ∩ ) ?
a) {25}
b) {3, 7, 12, 18, 19, 25}
c) {3, 7, 12, 18, 19}
d) {3, 7, 25}