A thermocouple having a linear relationship between $0\;^{\circ}C$ and $350 \:^{\circ}C$ shows an emf of zero and $30.5 \text{ mV}$, respectively at these two temperatures. If the cold junction temperature is shifted from $0\:^{\circ}C$ to $30^{\circ}C$, then the emf correction (in $\text{mV}$) is

1. $3.13$
2. $2.92$
3. $2.61$
4. $2.02$