What is the bid$-$ask spread if the current ask prices for DEF are $$8\mathrm{.}00$ and $$8\mathrm{.}17$ and current bid prices are $$7\mathrm{.}78$ and $$7\mathrm{.}93?$

$$0\mathrm{.}07$

$$0\mathrm{.}24$

$$0\mathrm{.}39$

$$0\mathrm{.}22$