Which of the following circuits provides full wave rectification of an $ac$ input?

In the circuit shown here, assuming the threshold voltage of the diode is negligibly small, the voltage $V_{A B}$ is correctly represented by which of the following graphs?

The output sinusoidal current versus time curve of a rectifier is shown in the figure. The average value of output current in this case is

If in a $p-n$ junction,a sinusoidal input signal is applied at $A$ as shown,then the output voltage $V_0$ will be:

In the circuit given below, $V(t)$ is the sinusoidal voltage source. The voltage drop $V_{AB}(t)$ across the resistance $R$ is:

In half-wave rectification,what is the output frequency if the input frequency is $50 \;Hz$? What is the output frequency of a full-wave rectifier for the same input frequency?