Looking for reliable answers? Westonci.ca is the ultimate Q&A platform where experts share their knowledge on various topics. Get detailed and accurate answers to your questions from a dedicated community of experts on our Q&A platform. Discover detailed answers to your questions from a wide network of experts on our comprehensive Q&A platform.

4. Which of the following relations is NOT a function?
O {(2, 1), (4, 3), (6, 5), (8, 7)}
O {(2, 1), (4,3), (6, 5), (8,5)}
O {(2, 1), (4, 3), (6,5), (2, 7)}
O {(2, 1), (4, 1), (6, 5), (8, 7)}