the figure abcd is transformed to a'b'c'd', as shown: which of the following sequence of transformations is used to obtain figure a'b'c'd' from abcd?

a) counterclockwise rotation by 90 degrees about the origin followed by translation down by 6 units

b) reflection about the y-axis followed by translation up by 6 units

c) counterclockwise rotation by 90 degrees about the origin followed by translation up by 6 units

d) reflection about the x-axis followed by translation down by 6 units