In the context of four statements (A-D) given below, which two of these statements cannot be true: simultaneously, assuming that there is at least one teacher in the college ?

A. All teachers are enthusiastic.
B. Some teachers are enthusiastic.
C. No teacher is enthusiastic.
D. Some teachers are not enthusiastic.

Choose the correct answer from the option given below :

A

A and B only

B

C and D only

C

A and C only

D

B and D only