Explanation:

- Option 1: Six years

This is partly true but not complete by itself. The term isn't strictly six years.

- Option 2: During the pleasure of the President

This doesn't apply to the Chief Election Commissioner. The tenure is not contingent on the President's pleasure.

- Option 3: For six years or till the age of 65 years, whichever is earlier

This option is correct. The Chief Election Commissioner serves for a fixed term of six years or until reaching 65 years of age, whichever comes first.

- Option 4: For five years or till the age of 60 years, whichever is earlier

This is incorrect. The tenure is neither five years nor ends at the age of 60.

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