Let A= { 15, 25, 35, 45, 55, 65 } and B= { 25, 45, 65} What is A∪B?

Choices:
a) {15, 35, 55}
b) { 25, 45, 65}
c) { 15, 25, 35, 45 }
d) {15, 25, 35, 45, 55, 65 }