09: Math Sets, Java Sets

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Suppose we have sets of integers S and T, and we have corresponding Java objects of type Set<Integer> named s and t. Are each of the following equivalent? Explain your answer in a single sentence. (1 point each)

A. 1 ∈ S and s.contains(1)

B. S ⊆ T and t.containsAll(s)

C. S ∪ T and s.addAll(t)

D. S \ T and s.removeAll(t)