An organization is granted the block $16\mathrm{.}0\mathrm{.}0\mathrm{.}0/8.$ The administrator wants to create $500$ fixed$-$length subnets.a$.$ Find the subnet maskb. Find the number of address in each subnetc. Find the first and last address in subnet $1$d$.$ Find the first and last address in subnet $500.$e$.$ The organization built up a LAN network as described in the below figure. Complete the routing tables of the two routers and assign appropriate IP network addressess of each LAN in the figure.