A uniform rod of length 2 m and mass 10 kg is placed on a table. It is made to rotate about an axis that passes through one of its ends and is perpendicular to the plane of the table with an angular velocity 10 $\mathrm{\pi }$ rad/s. Angular momentum of the rod about the given axis is:

• A

  $\frac{400\mathrm{\pi }}{3}{\mathrm{kgm}}^2/\sec$

• B

  $\frac{100\mathrm{\pi }}{9}{\mathrm{kgm}}^2/\sec$

• C

  $\frac{200}{7}{\mathrm{kgm}}^2/\sec$

• D

  $\frac{50}{9}{\mathrm{kgm}}^2/\sec$