Zero belongs to the following sets of real numbers:
- Whole numbers: 0 is considered a whole number (0, 1, 2, 3, ...).
- Integers: 0 is also an integer (..., -2, -1, 0, 1, 2, ...).
- Rational numbers: 0 can be expressed as a fraction (0 = 0/1), thus it is a rational number.
Therefore, the correct response is:
whole numbers, integers, and rational numbers.