Definition: You are given a question on college mathematics. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: Which of the following sets has the greatest cardinality?
(A)R (B)The set of all functions from Z to Z (C)The set of all functions from R to {0, 1} (D)The set of all finite subsets of R

C