During a attack, the attacker sends packets to a known service on the intermediary with a spoofed source address of the actual target system and when the intermediary responds, the response is sent to the target.

i would say 3 because windows is the best but vista doesnt do updates anymore

this seems to be in the wrong category. but i'll take some free points my dude

posting this in wrong category will result in people seeing it who won't know the answer.

leaning back,   no eye contact,   fidgeting in the seat