For each of the following, categorize the nature of the data using one of these three descriptions: (1) Discrete because the number of possible values is finite; (2) discrete because the number of possible values is infinite and countable; (3) continuous because the number of possible values is infinite and not countable.
a. Exact braking distances of cars, measured on a scale from 100 fit to 200 ft
b. Braking distances of cars, measured on a scale from 100 ft to 200 ft and rounded to the nearest foot
c. The numbers of students now in statistics classes
d. The number of attempts required to roll a single die and get an outcome of 7