In the Buddhist monasteries of ancient India, a ceremony called Parvan was held, which

• A. There was an opportunity to choose one speaker each on the subjects of Sanghparinayak and Dharma and Vinaya.
• B. During the rainy season there was an occasion for confession of the crimes committed by the monks during their stay in the monasteries.
• C. There was a ceremony of admitting a new person to the Buddhist sangha, in which his head was shaved and yellow clothes were given
• D. The day after the full moon of Ashadha was the occasion for the gathering of Buddhist monks, who were to choose fixed accommodation for the next four months of the rainy season.