Which of the following expressions is a polynomial? State the reason. If an expression is a polynomial,state whether it is a polynomial in one variable or not: $\sqrt{3} x^{2}+\pi x-9$
- AYes,it is a polynomial in one variable.
- BYes,it is a polynomial in two variables.
- CNo,it is not a polynomial.
- DYes,it is a constant polynomial.
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