If the Following Defines a One-To-One Function, Find Its Inverse $\{(-6,8),(-19,8),(-7,-12)\}$

Multiple Choice

If the following defines a one-to-one function, find its inverse. If not, write "Not one-to-one."
- $\{(-6,8) ,(-19,8) ,(-7,-12) \}$

A) $\{(-6,8) ,(8,-19) ,(-12,-7) \}$
B) $\{(8,-6) ,(-7,-19) ,(-12,8) \}$
C) Not one-to-one
D) $\{(8,-6) ,(8,-19) ,(-12,-7) \}$