President’s Bodyguards is :

The President’s Bodyguard (PBG) is an elite household cavalry regiment of the Indian Army, not a police or paramilitary force [3]. Established in 1773 as the Governor-General’s Bodyguard, it is the oldest and most senior regiment in the Indian Army's order of precedence [1]. While stationed at Rashtrapati Bhavan as the President's personal troops, the PBG is a regular military unit whose personnel are fully trained as horsemen, paratroopers, and tank-men [2]. They perform ceremonial duties such as escorting the President during state functions and guard mounting, but they also have operational roles, having served in major wars and UN Peace-Keeping Missions [3]. Since the PBG is a specialized unit of the Indian Army and not under the Delhi Police or the President's Secretariat's administrative control as a police force, the correct option is 'none of the above'.

Sources

1. [1] http://www.rashtrapatibhavan.gov.in/rbtour/silver-trumpet-banner-presentation-ceremony
2. [3] https://www.pib.gov.in/newsite/PrintRelease.aspx?relid=173629
3. [2] https://ramnathkovind.nic.in/pr171117.html