Among the following, a null set is (where N is the set of natural numbers)
Among the following, a null set is (where N is the set of natural numbers)
A) {x : x < 5 and x ∈ N)
B) {x : x2 = 4, x ∈ N}
C) {x : x2 + 1 = 0 x ∈ N}
D) {x : x is even prime}
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