The Chief Election Commissioner of India holds office for a specific period of time, as mentioned in option 3. According to this option, the Chief Election Commissioner serves for a term of six years or until they reach the age of 65, whichever comes earlier.

Option 1, which states "six years," is incorrect because it does not mention the age limit.

Option 2, which mentions "during the pleasure of the President," is incorrect because it implies that the Chief Election Commissioner serves at the pleasure of the President and does not have a fixed term.

Option 4, which states "for five years or till the age of 60 years, whichever is earlier," is incorrect because it does not align with the actual tenure of the Chief Election Commissioner.

Therefore, the correct answer is option 3, which specifies that the Chief Election Commissioner holds office for a period of six years or until they attain the age of 65, whichever comes earlier. It is essential to understand the correct tenure of the Chief Election Commissioner for a better understanding of the election process in India.