△rst is mapped to △r′s′t′ using the rule (x, y)→(x,−y) followed by (x, y)→(3x,3y)

which statement correctly describes the relationship between △rst
and △r′s′t′ ?

a.) △rst is not congruent to △r′s′t′ because the rules do not represent a sequence of rigid motions.
b.) △rst is congruent to △r′s′t′ because the rules represent a rotation followed by a translation, which is a sequence of rigid motions.
c.) △rst is congruent to △r′s′t′ because the rules represent a reflection followed by a rotation, which is a sequence of rigid motions.
d.) △rst is congruent to △r′s′t′ because the rules represent a reflection followed by a translation, which is a sequence of rigid motions.