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Okay so this is fairly simple to do. but only works when you are the attacker. What you do is you pick your Assault/Engineer/Recon class and use the explosive on the bomb site.
For Assault you need to use a shotgun to have c4 and just keep re-suppling yourself with the re-supply box.
Engineer you need to use the rocket launcher.
With the Recon class you can either use the Motor Strike or you can use the c4. And with every c4 you put on the bomb you get +50 xp. and it takes i think 2 rockets to start getting xp. The Motor Strike is one of the hardest because they dont go directly on the bomb site. but is very usefull at taking down a building with the bomb site inside of it.
Please thank and +rep would be appreciated.