Williamson ether systhesis for tert-butyl methyl ether is

Question

$\begin{array}{1 1}(a)\;(CH_3)_3C-O^{\ominus} k^{\oplus}+H_3C-Br\rightarrow product\\(b)\;CH_3O^{\oplus} Na^{\oplus}+(CH_3)_3C-Br\rightarrow product\\(c)\;(a)\;and\;(b)\\(d)\;None\end{array}$