As cited in the text of the UNDERSTANDING THE WINES OF SPAIN section, what changed in 1996 that has helped increase the quality and volume of Spain's wine production? Select one: a. Irrigating vineyards became legal. b. The DO system was established. (Equivalent to the AOC system of France.) c. Spain entered the EU and that increased demand and distribution d. Modern technologies like stainless steel were introduced. e. All the above happened in 1996 to help the Spanish wine industry. f. None of the above happened in 1996