Option b is the correct answer. Rajendra is credited to have built a huge artificial lake known as Chola Gangam, which means "the Ganges of the Cholas". It was located near his new capital of Gangaikonda Cholapuram, and was fed by the waters of the Kollidam river, a tributary of the Kaveri River. The lake was about 16 km long and 5 km wide and had a capacity of 16 million cubic meters. The lake was used for irrigation, navigation, and recreation purposes. The lake also symbolized Rajendra's conquest of the Ganges region and his imperial ambition. The lake was praised by many poets and historians, such as Kamban, Jayamkondar, etc.