$8.$ Which of the following is a correct network address with respect to the subnetmask $/20?$

a$.\_\_\_195\mathrm{.}45\mathrm{.}8\mathrm{.}0$

b$.\_\_\_187\mathrm{.}123\mathrm{.}60\mathrm{.}0$

c$.\_\_\_178\mathrm{.}44\mathrm{.}160\mathrm{.}0$

d$.\_\_\_$ All of the above