Concept: Ghusl is the full ritual bath in Islam, and a specific type is prescribed when a non-Muslim accepts Islam.
Explanation: When a new convert enters the fold of Islam, he or she is required to perform Ghusl known as Dukhil al-Islam.
This act symbolises spiritual purification, washing away the past, and beginning a fresh life as a Muslim.
The other options are not applicable here because Nifas refers to postnatal bleeding, Janabah refers to impurity caused by sexual activity, and Haydah refers to menstruation.
These conditions require ghusl in different contexts, but none of them relates to a new convert.
Therefore, the type of ghusl performed by a new convert to Islam is Dukhil al-Islam.
Answer: D. Dukhil al-Islam