What is the format of this proof? Given: ∠ABC is a right angle, ∠DBC is a straight angle
Prove: ∠ABD is a right angle

A horizontal line has points D, B, C. A line extends vertically from point B to point A. Angle A B C is a right angle.

A 2-column table has 8 rows. The first column is labeled Statements with entries angle A B C is a right angle, angle D B C is a straight angle, m angle A B C = 90 degrees, m angle D B C = 180 degrees, m angle A B D + m angle A B C = m angle D B C, m angle A B D + 90 degrees = 180 degrees, m angle A B D = 90 degrees, angle A B C is-congruent-to angle A B D. The second column is labeled Reasons with entries, given, given, definition of right angle, definition of straight angle, angle addition property, substitution property, subtraction property, and definition of right angle.

two-column proof
two-paragraph proof
flowchart proof
one-paragraph proof