Match the term to its definition.
1. {1, 2, 3, 4, ...}
2. {0, 1, 2, 3, 4, ...}
3. {...-4, -3, -2, -1, 0, 1, 2, 3, 4, ...}
4. first, second, third, ...
integers

whole numbers

ordinal numbers

natural numbers