The IP address $192\mathrm{.}12\mathrm{.}1\mathrm{.}0$ is a Class

address and, with a CIDR of block $/30,$ has a subnet mask of

hosts$/$subnet$.$

subnets and

A

C$,255\mathrm{.}255\mathrm{.}256\mathrm{.}252,64,2$

B

C$,255\mathrm{.}255\mathrm{.}255\mathrm{.}240,14,14$

C$,255\mathrm{.}255\mathrm{.}248\mathrm{.}0,30,2046$

D

C$,255\mathrm{.}255\mathrm{.}255\mathrm{.}252,64,2$