Explanation:

Explanation:
The Chief of Defence Staff post has been newly created to ensure jointness and synergy between the three defence services of India and optimum utilisation of the allocated budget.
Role of CDS:
• responsible for the administration of all three armed services including the army, navy and the air force. The main command of the services will be, however, with the respective Chief of the service. He will act as the principal military advisor to the Union Defence Minister. So, statement 1 is correct.
• senior to the three services’ chiefs but he will not have the authority to exercise any military command, including over the three service chiefs.
• serve as the head of the newly formed cyber and space agencies and the tri-service agency of Special Forces. The deployment of the Special Forces will, however, be decided by the ground commanders.
• head the headquarters of the Integrated Defence Staff, which comprises representatives from the three services. The Chief of the Integrated Defence Staff, who currently heads the triservices organization, will now be known as Deputy CDS and come under the authority of the CDS.
• All tri-services institutions will also come under the authority of the Chief of Defence Staff. So, statement 2 is correct
• hold the post of permanent chairman of the Chiefs of Staff Committee.
• The CDS will also not be eligible to hold a government office after retiring from the post. The Chief of Defence Staff (CDS) shall vacate the office on attaining the age of 65 years. So, Statement (3) is  correct.