Which IPv$4$ address can a host use to ping the loopback interface?$126\mathrm{.}0\mathrm{.}0\mathrm{.}1127\mathrm{.}0\mathrm{.}0\mathrm{.}0126\mathrm{.}0\mathrm{.}0\mathrm{.}0127\mathrm{.}0\mathrm{.}0\mathrm{.}1$