When analyzing the address $100\mathrm{.}25\mathrm{.}1\mathrm{.}1$ the host portion of the address is:

Group of answer choices

$\mathrm{.}1$

$1\mathrm{.}1$

$255\mathrm{.}25\mathrm{.}1\mathrm{.}1$

$100\mathrm{.}25\mathrm{.}1\mathrm{.}1$

$25\mathrm{.}1\mathrm{.}1$