Which of the following statements are logically equivalent?
A. All aeroplanes are polluting vehicles.
B. No polluting vehicles are aeroplanes.
C. All non-polluting vehicles are non-aeroplanes.
D. No aeroplanes are non-polluting vehicles.
Choose the correct answer from the options given below:
1
B and C only
2
B and D only
3
A and D only
4
A, C and D only