If the Following Defines a One-To-One Function, Find Its Inverse $\{(9,-5),(13,6),(19,20)\}$

Multiple Choice

If the following defines a one-to-one function, find its inverse. If not, write "Not one-to-one."
- $\{(9,-5) ,(13,6) ,(19,20) \}$

A) $\{(9,6) ,(9,13) ,(20,19) \}$
B) $\{(-5,9) ,(19,13) ,(20,6) \}$
C) $\{(-5,9) ,(6,13) ,(20,19) \}$
D) Not one-to-one