LetVi =x is in ℝ−1i≤ x ≤1i=−1i,1ifor each positive integer i. Find each of the following. (Enter your answers using interval notation.)(a)∪4i = 1Vi =Incorrect: Your answer is incorrect.(b)∩4i = 1Vi =Incorrect: Your answer is incorrect.(c)AreV1, V2, V3,mutually disjoint? Explain. Yes, because the union of the sets V1, V2, V3, ... is empty. Yes, because no two of the sets V1, V2, V3, ... have any elements in common. Yes, because the intersection of the sets V1, V2, V3, ... is empty. No, because no two of the sets V1, V2, V3, ... are disjoint. No, because the sets V1, V2, V3, ... are disjoint. Correct: Your answer is correct.(d)∪ni = 1Vi =Incorrect: Your answer is incorrect.(e)∩ni = 1Vi =Incorrect: Your answer is incorrect.(f)∪[infinity]i = 1Vi =Incorrect: Your answer is incorrect.(g)∩[infinity]i = 1Vi =