Acetic acid is titrated conductometrically with NaOH. Which description of the conductance curve is correct?

1. AConductance rises gradually up to the end point as the weakly conducting acid is converted into the salt $\mathrm{CH}{}_3\mathrm{COONa}$, then rises steeply due to excess $\mathrm{OH}{}^{-}$
2. BConductance decreases up to the end point and then increases
3. CConductance remains constant up to the end point and then decreases
4. DConductance rises steeply up to the end point and then increases only slowly