snap over punters head----safety?

[splitveer]

We had a situation the other night where the snap went over the punters head and into the endzone. What would be the ruling on each of these plays? By the way I am a coach wanting to make sure our punter handles this situation correctly.
a) punter kicks the ball out of the back of the endzone
b) punter scoops or bats the ball out of the back of the endzone
c) punter grabs the ball and throws or tosses the ball out of the back of the endzone.

What would be the call on each? Is there any other situation that would cause us to be penalized in this situation. Thanks a bunch.