$.$ Two solid, uniform, cylindrical flywheels rotate independently around a common axis. One of the flywheels rotates in one direction at $5\mathrm{.}000$ rad$/$s and the other rotates in the opposite direction at $4\mathrm{.}000$ rad$/$s$.$ Each flywheel has the same rotational inertia of $100\mathrm{.}0$ kg$$m$2.$ What is the magnitude of the net angular momentum of the system? A$)500\mathrm{.}0$ kg$$m$2/$s B$)400\mathrm{.}0$ kg$$m$2/$s C$)300\mathrm{.}0$ kg$$m$2/$s D$)200\mathrm{.}0$ kg$$m$2/$s E$)100\mathrm{.}0$ kg$$m$2/$s