Current at $t = 1 \: s$ is

Question

 

The potential difference across a 2H inductor as function of time is shown in figure. At time $t=0$, current is zero.

$\begin {array} {1 1} (a)\;1A & \quad (b)\;2A \\ (c)\;4A & \quad (d)\;8A \end {array}$