A triangle in a coordinate plane is rotated 90∘ clockwise about the origin, translated 3 units up, and reflected over the line y=x. Which statement is true?

a. The resulting triangle is congruent to the original triangle only if the rotation occurs first.
b. The resulting triangle is congruent to the original triangle regardless of the order of the transformations.
c. The resulting triangle is congruent to the original triangle only if the reflection occurs last.
d. The resulting triangle is not congruent to the original triangle regardless of the order of the transformations.