In a series RL circuit, the resistance and inductive reactance are the same. Then the phase difference between the voltage and current in the circuit is

A resistance of $400 \mathrm{\Omega }$ is connected in series with an inductor of $\left(\frac{3}{\pi }\right)$ $\mathrm{H}$ and this combination is connected across an $A\mathit{.}C\mathit{.}$ source as shown in figure.

The voltage across a pure inductor is represented by the following diagram. Which of the following diagrams will represent the current across it?