Consider the following in respect of sets A and B:1. (A - B) ∪ B = A2. (A - B) ∪ A = A3. (A - B) ∩ B = ϕ 4. A ⊆ B ⇒ A ∪ B = BWhich of the above are correct?

Consider the following in respect of sets A and B:1. (A - B) ∪ B = A

1.	Consider the following in respect of sets A and B:1. (A - B) ∪ B = A2. (A - B) ∪ A = A3. (A - B) ∩ B = ϕ 4. A ⊆ B ⇒ A ∪ B = BWhich of the above are correct?
A.	1, 2 and 3
B.	2, 3 and 4
C.	1, 3 and 4
D.	1, 2 and 4
Answer» C. 1, 3 and 4

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