What are the methods of collection of solid wastes? I. Refuse storage which may sometimes require delivery of refuse by the householder over a considerable distance II. Door-to-door collection, where the collector enters the premises and collects the refuse and the householder is not involved in the collection process. III. Dumping in river or stream

• A.  I & II                           
• B.  Only II
• C.  Only I             
• D.  All the above