Determine which of the following relations is a function.

A 2-column table with 5 rows. Column 1 is labeled x with entries negative 10, negative 5, 0, 5, 10. Column 2 is labeled y with entries 10, 5, 0, negative 5, negative 10.
A 2-column table with 5 rows. Column 1 is labeled x with entries negative 3, negative 1, 0, 0, 3. Column 2 is labeled y with entries 2, 1, 2, 1, 4.
A 2-column table with 5 rows. Column 1 is labeled x with entries negative 8, negative 2, 1, 2, 4. Column 2 is labeled y with entries negative 4, negative 2, 3, 4, 6.
A 2-column table with 5 rows. Column 1 is labeled x with entries 0, 1, 2, 2, 5. Column 2 is labeled y with entries 2, 4, 2, 6, 7.