II. Sec. 11, Art. XII of the Constitution, provides: "No franchise, certificate or any other form of authorization for the operation of a public utility shall be granted except to citizens of the Philippines or to corporations or associations organized under the laws of the Philippines at least sixty per centum of whose capital is owned by such citizens xx x." Does the term "capital" mentioned in the cited section refer to the total common shares only, or to the total outstanding capital stock, or to both or "separately to each class of shares, whether common, preferred non-voting, preferred voting or any class of shares?" Explain your answer. (5%)