The movement of potassium ions across a membrane aided by valinomycin is an example of _______________.

A)facilitated diffusion by transport through a pore
B)facilitated diffusion by transport using a carrier molecule
C)facilitated diffusion by use of a permease
D)primary active transport since valinomycin is a sodium-potassium ATPase
E)secondary active transport since valinomycin only moves with the aid of the sodium ion gradient