If C = {a, b, e, f} and D = {2, 4, 8, 10} then C ∩ D is _____?

{2, 4, 8, 10}

{}

{a, b, c, d, e, f}

None of these

To find the intersection (C ∩ D) of sets C and D, we need to find the elements that are common to both sets.

C = {a, b, e, f}

D = {2, 4, 8, 10}

Since there are no common elements between C and D, the intersection is an empty set.