What happens if an unpolarized light beam is incident on a surface at an angle of incidence equal to Brewster's angle?

The reflected and the refracted beam are both partially polarized.

The reflected beam is partially polarized and the refracted beam is completely polarized and are at light angels to each other.

The reflected beam is completely polarized and the refracted beam is partially polarized and are at right angels to each other.

Both the reflected and the refracted beams are completely polarized and are at right angles to each other.