Mathematics · JEE | RELATIONS AND FUNCTIONS

Which of the following relations from \( \{1, 2, 3, 4\} \) to itself is a function?

1. A
   \( \{(1, 1), (2, 2), (3, 3), (4, 4), (1, 4)\} \)
2. B
   \( \{(1, 2), (2, 3), (2, 4), (3, 1)\} \)
3. C
   \( \{(1, 2), (2, 3), (3, 4)\} \)
4. D
   \( \{(1, 2), (2, 3), (3, 4), (4, 1)\} \)