The correct answer is option 4: none of the above.

Option 1 states that President`s Bodyguards is a police force under the control of the President`s Secretariat. However, this statement is incorrect. The President`s Bodyguards is not a police force, but rather a prestigious military regiment of the Indian Army. They are responsible for providing protection and security to the President of India.

Option 2 suggests that President`s Bodyguards is a paramilitary force. While this is closer to the correct answer than option 1, it is still not entirely accurate. The President`s Bodyguards is not a paramilitary force, but rather a cavalry regiment. They are trained in horsemanship and carry out ceremonial and security duties.

Option 3 claims that President`s Bodyguards is a unit of Delhi Police. However, this is incorrect. The President`s Bodyguards is a separate entity from the Delhi Police and does not fall under their jurisdiction.

Therefore, the correct answer is option 4: none of the above.