The number of terms a President can serve is defined by the; The Executive Bill Article 2 Elastic Clause 22nd Amendment

## Step 1<br />The question is asking about the source of the rule that limits the number of terms a President can serve in the United States. The options provided are: The Executive Bill, Article 2, The Elastic Clause, and the 22nd Amendment.<br /><br />## Step 2<br />The Executive Bill, Article 2, and The Elastic Clause are all related to the U.S. Constitution, but they do not directly address the term limits for the President.<br /><br />## Step 3<br />The 22nd Amendment to the U.S. Constitution, however, does. It was ratified in 1951 and it limits the number of times a person can be elected as President: a person cannot be elected President more than twice, and a person who has served as President for more than two years of a term to which someone else was elected cannot be elected more than once.