Who were the two great grammarians of the Gupta period?

Read the following excerpt and answer the question that follows:

"After declaring his independence in Magadha, he with the help of a matrimonial alliance with the Lichchhavis, enlarged his kingdom."

(Source: https://egyankosh.ac.in/bitstream/123456789/20162/1/Unit-32.pdf)

Whom did Chandragupta I marry to strengthen his rule?

Which sciences flourished during the Gupta period?

What distinguished the Gupta governance from the Mauryan governance?