Angle KLM and angle MLN are a linear pair.

A horizontal line has points K, L, N. A line extends from point L up and to the right to point M.

Ray LR is to be added to the diagram so that it is opposite ray LM. Which is true about angle RLN that would be formed?

Angles RLN and MLK would be vertical angles.
Angles RLN and MLN would be vertical angles.
Angles RLN and KLM would be a linear pair.
Angles RLN and KLN would be a linear pair.