Consider the following pairs related to the Constituent Assembly:

S. No.	Personalities	Position
1.	Sir B.N. Rau	Secretary
2.	Prem Behari Narain Raizada	Constitutional Advisor
3.	H.V.R. Iyengar	Calligrapher

Which of the pairs given above is/are correctly matched?

About Constituent Assembly:

• Sir B. N. Rau was appointed as the Constitutional Advisor (Legal Advisor) to the Constituent Assembly.
• H.V.R. Iyengar was the Secretary to the Constituent Assembly.
• S.N. Mukerjee was the chief draftsman of the Constitution in the Constituent Assembly.
• Prem Behari Narain Raizada was the Calligrapher of the Indian Constitution. The original Constitution was handwritten by him in a flowing italic style.
• The original version was beautified and decorated by artists from Shantiniketan, including Nand Lal Bose and Beohar Rammanohar Sinha.
• Beohar Rammanohar Sinha illuminated, beautified and ornamented the original Preamble calligraphed by Prem Behari Narain Raizada.
• The calligraphy of the Hindi version of the original Constitution was done by Vasant Krishan Vaidya and elegantly decorated and illuminated by Nand Lal Bose.