Choose the correct method to find the sum of the interior angles of a triangle, where ∠1 , ∠2 , and ∠3 are the angles of a triangle.

Option A: (n−2)⋅180°

Option B: ∠1+∠2+∠3

Choose 1 for Option A, 2 for Option B, or 3 for both Option A and Option B.