In a quadrilateral ABCD, ∠C is a right angle, ∠ A is thrice of ∠ B and ∠D is 70°. Find ∠A and ∠B : 

1
120˚ and 80˚
2
110˚ and 90˚
3
150˚ and 50˚
4
140˚ and 60˚

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