Which of the following is a valid IP address?

a$.192\mathrm{.}186\mathrm{.}0\mathrm{.}900$

b$.192\mathrm{.}686\mathrm{.}100\mathrm{.}0$

c$.192\mathrm{.}186\mathrm{.}100\mathrm{.}0$

d$.192\mathrm{.}186\mathrm{.}700\mathrm{.}0$