An ISP is granted a block of classless addresses starting with 145.87.0.0/16. The ISP wants to distribute blocks of addresses to different customer groups as follows: (20 points) a. Customer Group 1: The number of customers in this group is 200. The type of customer is a medium-size business that needs 128 addresses. (6 pts) b. Customer Group 2: The number of customers in this group is 400. The type of customer is a small-size business that needs 16 addresses. (6 pts) c. Customer Group 3: The number of customers in this group is 2048. The type of customer is a household that needs 4 addresses. (6 pts) Design the blocks (ranges) for each customer in slash notation. For a, b and c, only show blocks for the 1st, 2nd and last customer - to get full credit for a, b or c, the 1st, 2nd and last customer blocks must all be correct. No gaps between customer groups. d. After a, b and c are satisfied, how many addresses remain for the ISP? (2 pts)