With A there is no debate.. Open fire through door. Empty the mag, reload, repeat challange and wait for response.
B) I would hope I have removed family to a safe location. But would have to go with my origional answer. I would fire thru door but not empty the gun.
This thread got me thinking a shotgun and my carry piece is not enough. Will be removing my rifle from safe as soon as I figure out where to place it. No young children in the house. If guests the bedroom is locked. "What you don't have a keyed lock on your bedroom????"