$3$Investigate the subnet block for the following scenario. An organization is granted a block of address with beginning address $14\mathrm{.}24\mathrm{.}74\mathrm{.}0/24.$ The organization needs to have $3$ subblocks of address in its three subnets.

a$)$ One subblock with $20$ addresses

b$)$ One subblock with $70$ addresses

c$)$ One subblock with $130$ addresses