Answer :

As we know that,

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

Out of the 4 given options, we have:

and are not polynomials as they have negative exponent.

is not a polynomial as it has non integral exponent.

And -4 can be written as -4x^{0}, thus it is a polynomial with integer power.

Thus, -4 is the correct option.

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