Chapter 4.1, Problem 4CP

Which of the following compounds is a strong electrolyte?

$\begin{array}{l}\text{a)}\hfill \\ \text{HF}\hfill \\ \text{b)}\hfill \\ {\text{H}}_{\text{2}}{\text{CO}}_{\text{3}}\hfill \\ \text{c)}\hfill \\ \text{NaF}\hfill \\ \text{d)}\hfill \\ {\text{NH}}_{\text{3}}\hfill \\ \text{e)}\hfill \\ {\text{H}}_{\text{2}}\text{O}\hfill \end{array}$