Match the polynomial with its description. [The polynomials are labeled (a), (b), (c), (d), (e), and (f).]
A third-degree polynomial with leading coefficient 1
a. $6 x$
b. $1-4 x^{3}$
c. $x^{3}+2 x^{2}-4 x+1$
d. 7
e. $-3 x^{5}+2 x^{3}+x$
f. $\frac{3}{4} x^{4}+x^{2}+14$