#$6$ CIDR network address $211\mathrm{.}125\mathrm{.}128\mathrm{.}0/20.$

Find network address in IP notation and network address in dotted notation?

a$.211\mathrm{.}125\mathrm{.}128\mathrm{.}0$ and $11010011011110111100000000000000$

b$.211\mathrm{.}125\mathrm{.}128\mathrm{.}1$ and $11010011011110110000000000000000$

c$.211\mathrm{.}125\mathrm{.}128\mathrm{.}0$ and $11010011011110110000000000001100$

d$.211\mathrm{.}125\mathrm{.}128\mathrm{.}0$ and $11010011011111011000000000000000$