Using VLSM$,$ which of the following subnets can be created from the $172\mathrm{.}16\mathrm{.}0\mathrm{.}0/20$ network to accommodate $500$ hosts?

Select one:

a$.172\mathrm{.}16\mathrm{.}0\mathrm{.}0/22$

b$.172\mathrm{.}16\mathrm{.}0\mathrm{.}0/23$

c$.172\mathrm{.}16\mathrm{.}0\mathrm{.}0/21$

d$.172\mathrm{.}16\mathrm{.}0\mathrm{.}0/24$