In an Allowed Electron Transition in a Hydrogen Atom,
A) $\Delta$

Multiple Choice

In an allowed electron transition in a hydrogen atom,

A) $\Delta$ $\ell$ = 0; $m _ { t }$ = 0, $\pm$ 1.
B) $\Delta$ $\ell$ = 0, $\pm$ 1; $m _ { t }$ = $\pm$ 1.
C) $\Delta$ $\ell$ = 0, $\pm$ 1; $m _ { t }$ = 0, $\pm$ 1.
D) $\Delta$ $\ell$ = $\pm$ 1; $m _ { t }$ = 0, $\pm$ 1.
E) $\Delta$ $\ell$ = $\pm$ 1; $m _ { t }$ = $\pm$ 1.