Option c is the correct answer. Vajrayana Buddhism was prominent during the sultanate period. It's a kind of Tantric Buddhism that grew in India. The name means 'Diamond Vehicle', 'Thunderbolt Vehicle', or the 'Indestructible Vehicle'. According to old Vajrayana stories, Buddha Shakyamuni and others like Vajrapani and Padmasambhava taught about tantra and Vajrayana. The Vajrayana writings say there are three ways to reach enlightenment: Hinayana, Mahayana, and Vajrayana. Important Tips Different Types of Buddhism: Theravada Buddhism: The older kind of Buddhism is called Theravada. Theravada is thought to be more traditional than Mahayana and Vajrayana in what they believe and how their monks behave. The teachings of Gautama Buddha are carefully kept by Theravada followers in their special book, the Pali Canon. The Pāli Canon is like the standard collection of scriptures for Theravada Buddhists. They kept it preserved in the Pāli language. This set of books has the oldest and fullest teachings of Buddhism that we still have today. It mostly comes from the Tamrashatiya school. It is the path to renunciation. Hinayana Buddhism: The word "Hinayana" means the 'smaller vehicle' and came about in the first or second century. People who follow the non-Mahayana Buddhism are called Hinayana. It can be divided into two groups - Shravakayana and Pratyekabuddhayana. Tantrayana Buddhism: This kind of Buddhism helps people change themselves (change their body, words, and thoughts). Like Vajrayana, it's connected with things called 'tantra' and 'secret mantra'.