Who among the following had written down the 'Ramcharita'?

The Ramacharitam is a Sanskrit epic poem written in Arya metre by Sandhyakar Nandi during Pala Empire, between approximately 1050 and 1150 CE. This work simultaneously narrates the story of the Ramayana and the Pala king Ramapala. The work is biased in favour of Ramapala, but remains an important historical source for the Pala history.