Look at the figure shown below: *attached image*

Which step should be used to prove that point A is equidistant from points C and B?

In triangles ABD and ACD, all three angles are equal.

In triangles ABC and ABD, one side and one common angle are equal.

In triangles ABC and ADC, two sides are unequal.

In triangles ABD and ACD, two sides and an included angle are equal.