According to legend, which German military figure’s dying words were — in reference to his soon-to-be implemented World War I strategy — “Remember, keep the right wing strong”?

According to legend, which German military figure’s dying words were — in reference to his soon-to-be implemented World War I strategy — “Remember, keep the right wing strong”?

Paul von Hindenburg
Helmuth von Moltke
Alfred von Schlieffen
Otto von Bismarck
Manfred von Richthofen

The correct answer is Alfred von Schlieffen