Triangle ABC is similar to triangle CDE. Both are right triangles. Which statements about the two triangles must be true? Choose all answers that are correct.

A. Sides AB and BC are proportional to sides CD and DE.

B. Side AC has the same slope as side CE.

C. Triangle ABC is congruent to triangle CDE.

D. Side AC is congruent to side CE

Which two triangles are similar?

A. A and B

B. B and C

C. A and D

D. A and C (this one right?)