Define a polynomial.

A polynomial is an algebraic expression that includes variables, coefficients, and exponents, where the exponents must be whole numbers (non-negative integers). This definition encompasses a wide range of expressions that can be formed using variables raised to various powers, multiplied by coefficients. The key characteristics of polynomials include their structure, which can involve multiple terms, and the requirement that the variables in the terms can only be raised to whole number powers.

This definition allows for polynomials to consist of single terms (monomials), two terms (binomials), or more, and it allows for a variety of coefficients, as long as the powers of the variables meet the condition of being whole numbers. Consequently, while other options mention certain aspects of polynomials, they do not capture the full definition as comprehensively as this one does.