Question a and b

- 7 . Consider a combinatorial auction over items { A, B, C, D} and with seven single-minded bidders. The auction uses the VCG mechanism and the following bids are being submitted: bidder 1 submits bid ({C},3); bidder 2 submits bid ({ A, B, C },8); bidder 3 submits bid ({B},4); . bidder 4 submits bid ({B, D},7); bidder 5 submits bid ({A},1); bidder 6 submits bid ({B,C},5); bidder 7 submits bid ({C, D},7). . 2 Perform the following two tasks. (a) [15 marks] Determine the winners of the auction above. (b) (15 marks] Determine all the payments and give the amount that the auctioneer obtains