Are you a modern warfare 2 expert????

COme here to see if you are a modern warfare 2 expert. OR an idiot.

1 The heartbeat sensor attachment does what?
2 The Scavenger perk does what?
3 The Marathon perk allows you to do what?
4 Last Question. What is the name of the last mission???
5 I lied that wasnt last question this is. What is the masterminds name?