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 but countable;
(3) Continuous because the number of possible values is infinite and not countable.
a. Exact lengths of the feet of members of the band the Monkees
b. Shoe sizes of members of the band the Monkees (such as 9, 9½, and so on)
c. The number of albums sold by the Monkees band
d. The numbers of monkeys sitting at keyboards before one of them randomly types the lyrics for the song "Daydream Believer."