$A$ diode is used as a/an

Statement-$I$: To get a steady $DC$ output from the pulsating voltage received from a full wave rectifier,we can connect a capacitor across the output parallel to the load $R_L$.
Statement-$II$: To get a steady $DC$ output from the pulsating voltage received from a full wave rectifier,we can connect an inductor in series with $R_L$.
In the light of the above statements,choose the most appropriate answer from the options given below:

If in a $p-n$ junction circuit,a square input signal of $5\,V$ is applied as shown,then the output across $R_L$ will be:

The output in the circuit shown in the figure is taken across a capacitor. The input signal is as shown in the figure.

$A$ full-wave rectifier circuit along with the input and output voltage waveforms is shown in the figure. The contribution to the output voltage from diode $2$ is:

If an alternating voltage is applied across a $p-n$ junction diode in series with a load,then: