Which of the following statements is correct about Prime Minister of India?

Which of the following statements given is incorrect?

Which one of the following Prime Ministers of India, never attended the Parliament during his tenure?

Who among the following held the office of the Prime Minister of India more than once?

Who among the following had the shortest span in office as the Prime Minister of India?

Which of the following person was not a Chief Minister of any state before holding the office of Prime Minister?