Which of the following statements are true?
$(A)$ The subsidiary quantum number $\ell$ describes the shape of the orbital occupied by the electron.
$(B)$ The image shows the boundary surface diagram of the $2p_x$ orbital.
$(C)$ The $+$ and $-$ signs in the wave function of the $2p_x$ orbital refer to charge.
$(D)$ The wave function of the $2p_x$ orbital is zero everywhere in the $yz$ plane.

• A
  $(B)$ and $(D)$ only
• B
  $(A)$,$(B)$ and $(C)$ only
• C
  $(C)$ and $(D)$ only
• D
  $(A)$ and $(B)$ only