With reference to the funds under Members of Parliament Local Area Development Scheme (MPLADS), which of the following statements are correct?
1. MPLADS funds must be used to create durable sets like physical infrastructure for health, education, etc
2. A specified portion of each MP fund must benefit SC/ST populations
3. MPLADS funds are sanctioned on yearly basis and the unused funds cannot be carried forward to the next year.
4. The district authority must inspect at least 10% of all work under implementation every year.
Select the correct answer using the code given below: