Statement-I:  All Lakshadweep Islands are of coral in origin and are surrounded by fringing reefs

Statement II:  Relief features such as streams and valleys are conspicuous by their absence in Lakshwadeep

Which one of the following is correct in respect of the above statements?

        River                                Origin 

1. Subarnarekha              : Ranchi Plateau 
2. Cauvery                        : Nandi Durg
3. Mahanadi                     : Dandakaranya