△MNP is mapped to △M'N'P' using each of the given rules. For which rules is △MNP congruent to M'N'P'?

Select each correct answer. (d is 1 over 6, not 1 6th)

a. (x, y) → (-y, x)
b. (x, y) → (1.6x, 1.6y)
c. (x, y) → (x, -y)
d. (x, y) → (1/6x, 1/6y)
e. (x, y) → (x-1, y+6)