Final answer:
The intersection of sets A = {a, b, c, d} and B = {c, d, e, f}, denoted as A ∩ B, is found by identifying the common elements between the two sets, which are 'c' and 'd'. Thus, the correct answer is A. {c, d}.
Step-by-step explanation:
The question asks to find the intersection of two sets A and B, denoted as A ∩ B. The intersection of two sets includes all the elements that are common to both sets.
In this case, we are given:
- A = {a, b, c, d}
- B = {c, d, e, f}
The common elements between set A and set B are 'c' and 'd'. Therefore, the intersection A ∩ B is {c, d}.
The correct answer to the question is: A. {c, d}.