A nutritionist is making a special vitamin mix using two drinks: A and B. The vitamin mix must contain at least 150 units of Vitamin A, at least 300 units of vitamin D, and at most 400 units of vitamin E. A cup of drink A contains 8 units of Vitamin A, 6 units of Vitamin D, 10 units of Vitamin E, and 4 units of Vitamin K. A cup of drink B contains 15 units of Vitamin A, 2 units of Vitamin D, 20 units of Vitamin E, and 12 units of Vitamin K. How many cups of each drink should be used to make the vitamin mix in order to minimize the amount of Vitamin K?