With reference to the office of the Governor of state, consider the following statements:
1. A Governor whose term has expired can be reappointed in the same state.
2. In the absence of President, his oath is administered by the Chief Justice of India.
3. A Governor enjoys the security of tenure of five years.
4. As per the Constitution, he may be removed only if he is proved to be of unsound mind.
How many of the above given statements are correct?