In the sinusoidal pulse-width modulation scheme, if the zero of the triangular wave coincides with the zero of the reference sinusoidal, then the number of pulses per half cycle is

• A. \(\frac{{{f_c}}}{{2f}}\)
• B. \(\frac{{{f_c}}}{{2f}} + 1\)
• C. \(\frac{{2{f_c}}}{f}\)
• D. \(\frac{{{f_c}}}{{2f}} - 1\)