$A$ block of weight $W$ is kept on a rough horizontal surface (friction coefficient $\mu$). Two forces of magnitude $W/2$ each are applied as shown in the figure. Choose the $\text{CORRECT}$ statement:

• A
  For $\mu > \frac{\sqrt{3}}{5}$, the block will move.
• B
  For $\mu > \frac{\sqrt{3}}{5}$, the work done by the friction force is zero (in the ground frame).
• C
  For $\mu > \frac{\sqrt{3}}{5}$, the friction force will do positive work (in the ground frame).
• D
  For $\mu < \frac{\sqrt{3}}{5}$, the block will move.