Use the Definition of the Derivative to Find the Derivative $f(x)=7 x^{4}-4 x+6$

Multiple Choice

Use the definition of the derivative to find the derivative of the function. $f(x) =7 x^{4}-4 x+6$

A) $-4 x+6$
B) $-4 x^{3}+6$
C) $7 x^{3}-4$
D) $28 x^{3}-4$