The orbital angular momentum of an electron in $2s$ orbitals is

  • A
    $+\frac{1}{2} \cdot \frac{h}{2\pi}$
  • B
    $0$
  • C
    $\frac{h}{2\pi}$
  • D
    $\sqrt{2} \cdot \frac{h}{2\pi}$

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