Which One of the Following Statements Relating to the Glass

Which one of the following statements relating to the glass electrode is correct?

A) The glass electrode detects hydrogen gas.
B) The glass of a glass electrode serves to conduct electrons.
C) When pH is measured, only a single electrode, the glass electrode, need be used.
D) The potential of the glass electrode varies linearly with the pH of the solution.
E) None of these statements is correct.