In an Atom That Has an Electron in a Sub-Shell $\ell$

In an atom that has an electron in a sub-shell for which $\ell$ = 4,with respect to the magnetic field vector $\vec { B }$ the magnetic moment vector $\vec { \mu }$ of the electron is allowed to be oriented in

A) any direction.
B) $\ell$ discrete directions
C) $\ell$ -1 discrete directions.
D) $\ell$ + 1 discrete directions.
E) 2 $\ell$ + 1 discrete directions.