Which of the following statements are true?
(A) The subsidiary quantum number $l$ describes the shape of the orbital occupied by the electron.
  is the boundary surface diagram of the $2 p_{\chi}$ orbital.
(C) The + and - signs in the wave function of the $2 p_{x}$ orbital refer to charge.
(D) The wave function of $2 p_{x}$ orbital is zero everywhere in the $x y$ plane.
Choose the correct answer from the options given below :