Whose philosophy is called the ‘Advaita’?

Q. Whose philosophy is called the ‘Advaita’?
A. Vallabhacharya
B. Vasumitra
C. Nagarjuna
D. Sankaracharya
Answer: Sankaracharya

A. Vallabhacharya
B. Vasumitra
C. Nagarjuna
D. Sankaracharya
Answer: Sankaracharya