Hindustani music is a traditional form of music from North India. It is known for its rich heritage and diverse styles. In Hindustani music, different styles and genres are incorporated to create a beautiful composition.

Let`s dissect each option to better understand the answer:

1) Dhrupad: Dhrupad is a genre of Hindustani classical music. It is characterized by its slow tempo, intricate rhythmic patterns, and emphasis on the use of Sanskrit poetry. Dhrupad is a significant part of Hindustani music and is performed by both vocalists and instrumentalists.

2) Khayal: Khayal is another genre of Hindustani classical music. It is a more popular style which emerged in the 18th century. Khayal focuses on improvisation and emotive expression. It is performed by vocalists and often accompanied by the tabla and harmonium.

3) Kriti: Kriti is a form of classical music that is associated with the Carnatic music tradition of South India. It is not a part of Hindustani music, which is primarily practiced in North India. Kritis are composed in the Carnatic style and are sung with traditional musical instruments.

4) Dadra: Dad