Jerry bought eight cans of Pepsi, seven cans of Sprite, three cans of Dr. Pepper, and six cans of Mountain Dew. He wants to bring 10 cans to his pal's house when they watch the basketball game tonight. Assuming the cans are distinguishable, say, with different expiration dates, how many selections can he make if he wants to bring a) Exactly four cans of Pepsi? b) At least four cans of Pepsi? c) At most four cans of Pepsi? d) Exactly three cans of Pepsi, and at most three cans of Sprite?