A Router has two interfaces $-$ one with $192\mathrm{.}168\mathrm{.}111\mathrm{.}1/24$ and another one with $10\mathrm{.}20\mathrm{.}5\mathrm{.}1/24.$ In the routing table $0\mathrm{.}0\mathrm{.}0\mathrm{.}0$ is found. this entry is for:

a$.$ The shortest route

b$.$ The default route

c$.$ The loop back route

d$.$ The static route