Host$-$A has the IPv$4$ address and subnet mask $10\mathrm{.}5\mathrm{.}4\mathrm{.}100255\mathrm{.}255\mathrm{.}255\mathrm{.}0.$ What is the network address of Host$-$A$?$

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$10\mathrm{.}0\mathrm{.}0\mathrm{.}0$

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$10\mathrm{.}5\mathrm{.}0\mathrm{.}0$

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$10\mathrm{.}5\mathrm{.}4\mathrm{.}0$

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$10\mathrm{.}5\mathrm{.}4\mathrm{.}100$

Question $2$