Heat generated in a circuit is given by $H=I^2Rt$, $I$ is current $R$ is resistance, $t$ is time. If percentage error in measuring $I$, $R$ and $t$ are $2 \%,1\%$ and $1\%$ respectively. what is the maximum error in measuring heat

Question

$$(a)\;2 \%\quad (b)\;3\% \quad (c)\;4 \%\quad (d)\;6 \%$$