V(t) = Vm cos(ωt) is applied to a half-wave rectifier. What is the RMS value of the output wave?

• A. \(\frac{{{I_m}}}{{2\pi }}\)
• B. \(\frac{{{I_m}}}{{\pi }}\)
• C. \(\frac{2{{I_m}}}{{\pi }}\)
• D. \(\frac{{{I_m}}}{{2}}\)