For two sets P and Q, if O(P) = O(Q) then ______?

P ⊆ Q

P ⊂ Q

P ~ Q

None of these

O(P) = O(Q) means the number of elements in P is equal to the number of elements in Q.

This implies that P and Q have the same cardinality, which can be represented as P ~ Q (P is equivalent to Q).