The 'Vinaya Pitaka' dealt with _________.

Rules and regulations for those who joined the 'sangha' or monastic order.

The correct answer is Option (3) → Rules and regulations for those who joined the 'sangha' or monastic order.

The 'Vinaya Pitaka' deals with:

Rules and regulations for those who joined the 'sangha' or monastic order.

The Vinaya Pitaka is one of the three "baskets" or collections of teachings in the Tripitaka (Pali Canon) in Buddhism.

It primarily contains rules and guidelines for the conduct and discipline of monks and nuns in the Buddhist monastic order (sangha).

These rules cover various aspects of monastic life, including behavior, rituals, and ethical standards.

So, the correct option is [3].