The correct answer is option 2: The expenditure which is charged on the Consolidated Fund of India can be discussed but is not put to vote before the Parliament.

The Consolidated Fund of India is a fund into which all revenues received by the government are credited and from which all expenditure is made. There are certain expenditures called charged expenditures which are charged directly on the Consolidated Fund of India and do not require authorization from Parliament.

Although the charged expenditures are not put to vote before the Parliament, they can still be discussed. This allows for transparency and accountability as the government is required to provide explanations and justifications for these expenditures during the discussion.

Option 1 is incorrect because the charged expenditures are not voted by the Parliament. Option 3 is also incorrect because they can be discussed by the Parliament. Option 4 is incorrect because the charged expenditures are not exclusively discussed and voted by the Lok Sabha, but can be discussed by both houses of Parliament.