Which of the following is true?
A. ({1, 2}, {3}) and ({1, 3}, {2}) are different ordered partitions.
B. The number of ordered partitions of s = {x, y, z} of type (1, 2) is the same as the number of permutations of {x, y, z}.
C. ({1, 2}, {3}) and ({2, 1}, {3}) are different ordered partitions.
D. If S = {x, y, z, w, u, v} then there are more unordered partitions than ordered partitions of S of type 
E. none of these
Answer: A
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