The IP address $156\mathrm{.}35\mathrm{.}0\mathrm{.}0$ is a Class $\_\_\_\_\_$ address and with a CIDR of $/21$ has a subnet mask of $\_\_\_\_$ with $\_\_\_\_$ subnets and $\_\_\_\_$ hosts$/$subnets$.$

Question $5$Select one:

a$.$

B$,255\mathrm{.}255\mathrm{.}255\mathrm{.}252,16382,2$

b$.$

B$,255,255,255,128,510,126$

c$.$

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

d$.$

None of these answers is correct.