In an electrochemical series the metals having higher negative potentials are placed on top, while those with lower negative potentials or positive potentials lie at the bottom. Which one of the following is a true statement?

A. Metals lying high up in the series can provide protection to those lower in the series
B. Metals high up in series can be used as sacrificial anodes for those lying below them
C. Metals lying at the top of series are called as noble metals
D. None of the above