Consider these two triangles. Triangle A'B'C' is the dilated figure with a scale factor of 3.

Triangle A B C has side lengths 5 centimeters, 7 centimeters, 3 centimeters. Triangle A prime B prime C prime.

What can be concluded about the two triangles? Check all that apply.
The triangles are similar.
The corresponding sides are proportional.
The length of A'B' is 15.
The length of B'C' is 9.
The dilation is a reduction.