The correct answer is: Election of public officials.
The United States was the first country to use the principle. That describes it as people of a country or territory, they have the power and right to self-rule and they must consent, either in a direct referendum or through elections in order to establish their own government. People can vote to elect their representatives.
This explains the principle, in one of the lines of the declaration of the independence of the united states, below:
"We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness. That to secure these rights, Governments are instituted among Men, deriving their just Powers from the Consent of the Governed"