Assume that a bank's bid rate on Swiss francs is $$\mathrm{.}48$ and its ask rate is $$\mathrm{.}50.$ Its bid ask percentage spread is: $($In case you need excel, here is a link: blank spreadsheet $x|sx|)$

A$.$ about $4\mathrm{.}44\%.$

B$.$ about $4\mathrm{.}26\%$

C$.$ about $4\mathrm{.}00\%$

D$.$about $4\mathrm{.}17\%$