The Primary Difference Between a 3- Bit Up- Counter and a 3-

The primary difference between a 3- bit up- counter and a 3- bit down- counter is:

A) An up counter's output decreases by one with each input clock pulse whereas a down counter's output increases by one with each input clock pulse.
B) An up counter's output increases by one with each input clock pulse whereas a down counter's output decreases by one with each input clock pulse.
C) In a normal count sequence, a 000 is followed by 001 (in an up- counter) and by 111 (in a down- counter) .
D) Both B and C
E) Both A and C