Zero belongs to the following sets of real numbers:
- Whole numbers (as whole numbers include all non-negative integers starting from zero)
- Integers (as integers include all positive and negative whole numbers, as well as zero)
- Rational numbers (as rational numbers are defined as numbers that can be expressed as a fraction of two integers, and zero can be expressed as 0/1)
Therefore, the correct response is:
whole numbers, integers, and rational numbers