*Note: A polynomial is an expression having variables and coefficients, that involves only the operations of addition, subtraction, multiplication, and non-negative integer exponents of variables.

Now, and is not a polynomial because it does not contain integer power of the variable “x”.

And, is not a polynomial because it contains a negative power of the variable, which is not the criteria for a polynomial.

∴ is a polynomial it contains only integral powers of the variable (x) i.e. x²

Hence, option D is correct