The value of conic product of water at $393\;K$ is

Question

$\begin{array}{1 1} \text{Less than $1 \times 10^{-14}$} \\ \text{Greater than $1 \times 10^{-14}$} \\ \text{equal to $1 \times 10^{-4}$} \\ \text{equal to $1 \times 10^{-7}$} \end{array} $