Find the set that describes the intersection of each pair of sets:
a. C={people who are more than 20 years old}.
D={people who are enrolled in college}.
b. A={4,6,8}, B={2,4}.
c. E={the odd whole numbers},
F={the even whole numbers greater than 40}.
(a) {people who are more than 20 years old and enrolled in college}
(b) {4}
(c) {}