A: 1.99904274017 but that's close enough for non-technical people.
Two, but I don't know how they'll fit inside the bulb
Only two, but you've got to wonder how they climbed up there!
As a mother, I choose not to screw it in. Light bulbs are dangerous weapons created by the Soviet Union, and I will not screw it in; it could severely hurt my child. As everyone knows, light bulbs are the principle source of autism in this world, and I have to take a stand on it.
Not all of them.
