Assertion: The possible percentage error in computing the parallel resistance $\mathrm{R}$ of three resistance ${\mathrm{R}}_1,\mathrm{ }{\mathrm{R}}_2,\mathrm{ }{\mathrm{R}}_3,$ from the formula

$\frac{1}{\mathrm{R}}=\frac{1}{{\mathrm{R}}_1}+\frac{1}{{\mathrm{R}}_2}+\frac{1}{{\mathrm{R}}_3}$ , if ${\mathrm{R}}_1,\mathrm{ }{\mathrm{R}}_2,\mathrm{ }{\mathrm{R}}_3$ are each in error by plus $1.2\mathrm{\%}$ is $1.2\mathrm{\%}$

Reason: $\frac{∆\mathrm{R}}{{\mathrm{R}}^2}=\frac{∆{\mathrm{R}}_1}{{\mathrm{R}}_1^2}+\frac{∆{\mathrm{R}}_2}{{\mathrm{R}}_2^2}+\frac{∆{\mathrm{R}}_3}{{\mathrm{R}}_3^2}$

A physical quantity $P$ is described by the relation $P=a^{\frac{1}{2}} b^2 c^3{d}^{-4}$. If the relative errors in the measurement of $a$, $b$, $c$ and $d$ respectively, are $2\%$, $1\%$, $3\%$ and $5\%$. Then the relative error in $P$ will be:

Two students $P$ and $Q$ perform an experiment to verify Ohm's law for a conductor with resistance $R$. They use a current source and a voltmeter with the least counts of $0.1 \mathrm{mA}$ and $0.1 \mathrm{mV}$, respectively. The plots of the variation of voltage drop $V$ across $R$ with current $I$ for both are shown below.

The statement which is most likely to be correct?