Resistance of metal is given by $R=\large\frac{V}{I}$. $V$ is potential difference, $I$ is current. In a circuit $V=(8 \pm 0.5)v$ and current is $I=(2 \pm 0.2)A$. what is value of resistance with percentage error?
$(a)\;4 \Omega \pm 16.25 \% \quad (b)\;(4 \pm 0.7)\Omega \quad (c)\;4 \Omega \pm 0.7\%\quad (d)\;4 \Omega \pm 7\%$