$($c$)$ Ambient air has a dry$-$bulb temperature of $\backslash (35^\{\backslash$circ$\}\backslash$mathrm$\{$C$\}\backslash )$ and relative humidity of $\backslash (85\backslash \%\backslash )$ at a barometric pressure of $95$ kPa $.$ Condensation occurred at the external wall of an air$-$conditioned lift lobby. At the time when the condensation occurred, what was the possible maximum temperature of the external wall?

$(6$ marks$)$