Which among the following is considered to be the official law book of the Guptas?

Q. Which among the following is considered to be the official law book of the Guptas?
Answer: Yajnavalkya Smriti
Notes: The Yajnavalkya Smriti is one of the Dharma-related texts of Hinduism composed in Sanskrit. It is dated to between the 3rd to 5th-century CE, and belongs to the Dharmasastras tradition. It was the official law book of the Guptas.