Which of the following statements are logically equivalent to the statement "Some professors are spiritualists"?
A. Some spiritualists are professors.
B. Some non-spiritualists are not non-professors.
C. No spiritualists are professors.
D. Some professors are not non spiritualists.
Choose the correct answer from the options given below:
1
A, B & D only
2
A & D only
3
B & C only
4
C & D only