Which of the following propositions are so related that they cannot both be true, although they can both be false?
(A) No professors are materialists
(B) Some professors are materialists
(C) All professors are materialists
(D) Some professors are not materialists
Choose the correct answer from the options given below:
1
(A) and (C) Only
2
(B) and (D) Only
3
(B) and (C) Only
4
(A) and (D) Only