Using the following schema: article | dealer | price | 1 | A 13.45 1| B | 3.99 10.99 21 A 3 | B 3 | C 31 D 41 D 1.45 1.69 1.25 19.95 Write a query to produce: 1. display the price, the name of the dealer and the number of the most costly article. 2. Get the most expensive price per article. 3. For each article, locate the dealer or dealers with the most costly price.