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Identify the missing parts in the proof.
Given: ABC is a right angle.
DB bisects ABCZ
Prove mCBD = 45°
A: 1. Division 2. Definition of bisects 3. Definition of right angle 4. Given
B: 1. Measure of angle ABC = 90 2. Measure of angle = 180 3. Measure of angle ABD = 90 4. Measure of angle CBD = 180
C: 1. Addition 2. Angle of postulate 3. Definition of right angle 4. Substituion property
D: 1. Angle ABC = 90 2. Angle ABD = 90 3. 2 times the measure of angle ABC = 90 4. 2 times the measure of angle CBD = 90