C. How many subsets can be formed out of the given set? 1) H = {months of the year that starts with J} 2) O = {x|x is a multiple of 9, x > 20} 3) P = {x|x is a two-digit multiple of 10} 4) E = {x|x is an even counting number, x ≤ 20} 5) S = {x|x is a natural number, 5​