40 POINTS AND WILL MARK BRAINLIEST TO CORRECT ANSWER What kind of triangle is △BCD? Explain.

Triangle B C D sitting on line B D. At vertex B, angle 1 is exterior to the triangle and angle 2 is interior. Together, 1 and 2 form a straight angle. At vertex C, the interior angle measure is 70 degrees. At vertex D, the interior angle is not labeled and the exterior angle has measure 130 degrees.
Group of answer choices

Right triangle; m∠2 = 90

Isosceles triangle; m∠CDB = m∠2

Obtuse triangle; m∠CDB = 180 − 70 = 110

Acute triangle; m∠CDB = 180 − 130 = 50 and m∠2 = 180 − 70 − 50 = 60
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