The electric potential in a certain region varies with position as V(x)=ax²-bx+c, where a = 2.4 V/m², b = 12 V/m, and c = 7.5 V.
a)V′(x)=4.8x-12
b)E(x)=-4.8
c)V′′(x)=4.8
d) None of the above