An isp is granted an address block 150.80.0.0/16. the isp wants to distribute these to customers as follows: i. the first group has 200 medium size businesses; each needs 128 addresses. ii the second group has 400 small businesses; each needs 16 addresses. the third group has 2048 households; each needs 4 addresses. design the sub-blocks and give the slash notation for each sub-block. find out how many addresses are still available after these allocations.