The peak shopping time at the pet store is between 8:00am and 11:00am on Saturday mornings. Management at pet store randomly chosen 30 customers last Saturday morning as well as decided to observe their shopping habits. They recorded the number of items that the sample of the customers bought as well as the total time the customers spent in store. Determine the types of variable recorded by the pet store.
a. number of items, continuous; total-time, discrete.
b. number of items, discrete; total-time, discrete.
c. number of items, continuous; total-time, continuous.
d. number of items, discrete; total-time, continuous.