In the Preamble to the Indian Constitution, which word signifies "elected head of state"?

In the Preamble to the Indian Constitution, the term "republic" indicates that India has an elected head of state (the President) rather than a hereditary monarch. The President of India is chosen by an Electoral College consisting of elected members of both houses of Parliament and State Legislative Assemblies. The Preamble begins with "We, the people of India," emphasizing that citizens are the ultimate source of power. The Preamble defines India as a "sovereign, socialist, secular, democratic republic," with each term having distinct constitutional significance.