Explanation:

- Governor: The Governor of a state holds office at the pleasure of the President. This means the President can remove the Governor without stating any reason.

- Election Commissioner: They do not hold office at the pleasure of the President. They have a secure tenure and can only be removed through a set procedure akin to that of a Supreme Court judge.

- Speaker of Lok Sabha: The Speaker is elected by Lok Sabha members and does not serve at the President's pleasure. The Speaker's tenure is tied to the life of the Lok Sabha.

- Prime Minister: The Prime Minister holds office as long as he/she has the majority support in the Lok Sabha, not at the President's pleasure.