If the Function Is One-To-One, List the Inverse Function by Switching

Multiple Choice

If the function is one-to-one, list the inverse function by switching coordinates or inputs and outputs.
-f = {(-6, -9) , (6, 9) , (7, 11) , (-7, -11) }

A) f-1 = {(-9, -6) , (9, 6) , (11, 6) , (-11, -7) }
B) f-1 = {(-9, -6) , (-6, 6) , (11, 7) , (-11, -7) }
C) f-1 = {(-9, -6) , (9, 6) , (11, 7) , (-11, -7) }
D) not one-to-one