Which Buddhist compilation included the rules and regulations for those who joined the sangha or monastic order?

Vinaya Pitaka

The correct answer is Option (2) → Vinaya Pitaka

The Vinaya Pitaka included rules and regulations for those who joined the sangha or monastic order; the Buddha’s teachings were included in the Sutta Pitaka; and the Abhidhamma Pitaka dealt with philosophical matters. Each pitaka comprised a number of individual texts. Later, commentaries were written on these texts by Buddhist scholars.