Explanation:

All statements are correct.

• The Election Commission of India (ECI) is an autonomous constitutional authority responsible for administering Union and State election processes in India.
• The body administers elections to the Lok Sabha, Rajya Sabha, and State Legislative Assemblies in India, and the offices of the President and Vice President in the country.
• Part XV of the Indian constitution deals with elections, and establishes a commission for these matters.
• The Election Commission was established in accordance with the Constitution on 25th January 1950.
• Article 324 to 329 of the constitution deals with powers, function, tenure, eligibility, etc of the commission and the members.
• Originally the commission had only one election commissioner but after the Election Commissioner Amendment Act 1989, it has been made a multi-member body.
• The commission consists of one Chief Election Commissioner and two Election Commissioners appointed by the President of India.
• They have a fixed tenure of six years, or up to the age of 65 years, whichever is earlier.
• The Chief Election Commissioner can be removed from office only through a process of removal similar to that of a Supreme Court judge by Parliament.

Hence option 4th is correct.