Which type of data (categorical, discrete numerical, continuous numerical) is each of the following variables? a. Age

Question:

Which type of data (categorical, discrete numerical, continuous numerical) is each of the following variables?
a. Age of a randomly chosen tennis player in the Wimbledon tennis tournament.
b. Nationality of a randomly chosen tennis player in the Wimbledon tennis tournament.
c. Number of double faults in a randomly chosen tennis game at Wimbledon.