What is the significance of INS Sandhayak, recently delivered to the Indian Navy by Garden Reach Shipbuilders and Engineers (GRSE)?

A. It is the largest hospital ship in the Indian Navy

B. It is part of a series of four combat vessels by GRSE

C. It is the first indigenous survey vessel marking a milestone in Indian shipbuilding

D. It is designed solely for low-intensity combat operations

C. It is the first indigenous survey vessel marking a milestone in Indian shipbuilding