Write the largest possible subnet mask if three computers $223\mathrm{.}2\mathrm{.}7\mathrm{.}6,223\mathrm{.}2\mathrm{.}7\mathrm{.}1$ and $223\mathrm{.}2\mathrm{.}7\mathrm{.}5$ are all in the same subnet.$($Largest possible subnet mask means the largest CIDR number.$$ This is the subnet which uses the smallest number of addresses.$)$

Group of answer choices

$8$ bits

$16$ bits

$23$ bits

$28$ bits

$29$ bits

$32$ bits