Games : Does cleaning camps count towards "enemies-killed" stacks?

Example: Raynor - Seasoned Marksman

For every 6 enemy Minion or Mercenary kills near your Hero, gain 1 Basic Attack damage. Hero Takedowns count as 2 Minion kills.

What is meant by Mercenary kill?

1. When you kill an enemy teams Mercenary?


2. When you kill Mercenaries in the jungle? (technically you don't kill them)


3. Both