Identify from the information below whether X is a discrete or continuous random variable.
a. Let X be the height of a randomly selected 8-year-old child.
b. Let X be a random variable that takes values on the nonnegative integers, i.e X ( {0,1,2,3,...}.
c. Let X be a random variable that takes values on all nonnegative real umbers, i.e., X ≥ 0.
d. Let X be the number of 8-year-old children who will attend the 1:30 showing of the movie "Shrek 3."