(a) An ISP is granted a block of IP addresses with the network address 152.101.160.0/19. The ISP needs to allocate addresses for one organization with 4000 addresses, three organizations each with 1000 addresses, one organization with 500 addresses, and three organizations each with 120 addresses. Determine the range of addresses for each organization and the range of unallocated addresses (if any). (7 marks)