In the context of the Indian Constitution, the term "Pocket Veto" refers to the power of the President to withhold their assent to a bill passed by Parliament. The correct answer is option 4, which states that the President can keep a bill for an indefinite period. This means that the President can effectively prevent a bill from becoming a law by neither giving their assent nor returning it for reconsideration within a specified time frame. Unlike other bills, which require the President to either give their assent or return the bill within a specific time, a pocket veto does not have any time constraint. Thus, if the President exercises a pocket veto, the bill remains pending and does not become law. Alert - correct answer should be option 4 (Indefinite period).