Determine whether the following function is a polynomial function. If the function is a polynomial function, state its degree. If it is not, tell why not. Write the polynomial in standard form. Then identify the leading term and the constant term.

$F(x)=7x^7-x^2+\frac{1}{4}$

Determine whether $F(x)$ is a polynomial or not. Select the correct choice below and, if necessary, fill in the answer box to complete your choice.

A$.$ It is not a polynomial because the variable $x$ is raised to the power, which is not a nonnegative integer.

$($Type an integer or a fraction.$)$

B$.$ It is a polynomial of degree

$($Type an integer or a fraction.$)$

C$.$ It is not a polynomial because the function is the ratio of two distinct polynomials, and the polynomial in the denominator is of positive degree.