Given below are two statements, one labeled as Assertion and the other labeled as Reason (R) :<br>Assertion (A) : Mangroves are very specialized forest eco-systems of tropical and sub-tropical regions bordering certain sea coasts.<br>Reason (R): They stabilize the shoreline and act as bulwark against encroachments by sea.In the context of the above two statements, which of the following is correct? 
Both A and R are true but R is not a correct explanation of A
Option :b