Option 1 states that the expenditure which can be charged on the Consolidated Fund of India is discussed and voted by the Parliament. This means that the Parliament has the authority to discuss and make decisions regarding the spending that will be charged on the Consolidated Fund of India. However, this option is incorrect as it does not fully align with the correct answer.

Option 2 suggests that the expenditure can be discussed, but it is not put to vote before Parliament. This means that although discussions can take place, the final decision on whether to approve the expenditure is not made through voting. This option aligns with the correct answer.

Option 3 states that the expenditure cannot be discussed or voted upon by Parliament. However, this contradicts the nature of parliamentary decision-making processes and is therefore incorrect.

Option 4 suggests that the expenditure is discussed and voted only by the Lok Sabha, which is one of the two houses of Parliament in India. However, this option does not account for the role of the Rajya Sabha, the other house of Parliament. Therefore, this option is also incorrect.

In conclusion, the correct answer is option 2, which states that the expenditure can be discussed but is not put to vote before Parliament.