The correct answer is: a) Mughal rulers.
The Akhnoor Fort was built by Akbar, the third Mughal emperor, in the 16th century. It is located on the banks of the Chenab River in the Jammu region of India. The fort is a large, rectangular structure with four towers at each corner. It is made of red sandstone and has a moat around it. The fort was used as a military base by the Mughals and later by the Dogra kings. It is now a tourist attraction.
The other options are incorrect. The Dogra kings ruled Jammu and Kashmir from the 18th to the 20th centuries. The Mauryan Empire was an ancient Indian empire that ruled from the 4th to the 2nd centuries BCE. The Karkota dynasty was a medieval Indian dynasty that ruled Kashmir from the 7th to the 9th centuries CE.