Consider two possible schemes for measuring angular velocity with an encoder. In Scheme A, a timer is set for a specified time interval TA, and the number of W/B transitions, MA, occurring in that interval are counted. In Scheme B, the time, TB, required for a fixed number MB of W/B transitions is measured.
Which of the following statements is true?

a. In scheme A, time interval TA is not the exact time that has elapsed for MA W/B transitions.
b. In scheme A, time interval TA is the exact time that has elapsed for MA W/B transitions.
c. Scheme A and scheme B, both have the same level of accuracy.
d. Scheme A is better than scheme B.
e. Scheme A is equivalent to scheme B.