Answer : 4. "BN Goswami"
Explanation :

Noted art historian and writer BN Goswami died on Friday at the Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh. His age was 90 years. Goswami was born on August 15, 1933. The Padma Shri and Padma Bhushan awardee is known for his work in Pahari style painting. Goswami, known as BNG in the art world, has written more than 26 books on subjects including Pahari painting, miniature painting, court painters and masters of Indian painting.