M$2.$new$\mathrm{.}4)$ How does doping silicon with phosphorous create an n$-$type semiconductive material?

Question $16$ options:

Phosphorous has three electrons in its outer shell. This leaves one bond with silicon with one electron, creating a 'hole' in the structure, and allowing electrons to fill the holes

Phosphorous has five electrons in its outer shell. This leaves one bond with silicon with one electron, creating a 'hole' in the structure, and allowing electrons to fill the holes

Phosphorous has three electrons in its outer shell, so the fifth electron is free to roam around the silicon structure and create current

Phosphorous has five electrons in its outer shell, so the fifth electron is free to roam around the silicon structure and create current