For a $Bohr$ atom,the angular momentum of an electron is given by $M(n = 1, 2, 3, .....)$ :
- A$\frac{n h^2}{2 \pi}$
- B$\frac{n^2 h^2}{2 \pi}$
- C$\frac{\sqrt{n h^2}}{2 \pi}$
- D$\frac{n h}{2 \pi}$
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