The question refers to a full-wave bridge rectifier circuit with a switch $S$, and asks for the output voltage waveform across the load resistor $R_L$ when the switch is closed. Because both the circuit diagram and the graphical options for the output waveforms are missing from the provided text, the specific effect of closing the switch (such as introducing a filter capacitor to smooth the output) cannot be determined. Consequently, the correct output pattern cannot be independently evaluated.