An ISP is granted a block of addresses starting with 128.100.0.0/15. The ISP wants to distribute these blocks to 2600 customers as follows a. The first group has 100 Large-size businesses; each need 512 addresses b. The second group has 300 medium-size businesses; each need 64 addresses c. The third group has 800 small-size businesses; each need 16 addresses Design the subblocks and give the slash notation for each block. Find out how many addresses are still available after these allocations