Which one of the following Buddhist texts contain the rules and regulations for those who joined the Buddhist 'sangha' or monastic order?

Vinaya Pitaka

The correct answer is Option (2) → Vinaya Pitaka

The Tipitaka consisted of the Vinaya Pitaka, which included rules and regulations for those who joined the monastic order (sangha); the Sutta Pitaka, containing the Buddha's teachings; and the Abhidhamma Pitaka, which delved into philosophical matters. Each pitaka comprised multiple individual texts. Over time, Buddhist scholars wrote commentaries on these texts.