is 0 a rational number, irrational number, natural number, whole number , or integer

0 is a rational number, a whole number, and an integer.

A rational number is any number that can be expressed as a fraction where the numerator and denominator are integers, and the denominator is not equal to zero. Since 0 can be expressed as 0/1, it is considered a rational number.

A whole number is a number without any fractional or decimal parts. As 0 does not have any fractional or decimal parts, it can also be classified as a whole number.

An integer is a number that includes all whole numbers and their opposites (negative whole numbers). Since 0 is an integer, it is included in this classification as well.

pick the best definition

The best definition for 0 would be that it is a rational number.

another one

The best definition for 0 would be that it is a whole number.