Kite abcd is reflected over the line y = x. what rule shows the input and output of the reflection, and what is the new coordinate of a'? a. (x, y)→(y, x); a' is at (2, −7) b. (x, y)→(−x, y); a' is at (7, 2) c. (x, y)→(−x,−y); a' is at (7, −2) d. (x, y)→(y,−x); a' is at (2, 7) i think the answer is c, but i'm not sure.