What are the advantages of using PVC in Water supply pipes and Industrial piping over GI pipes? I. They are heavy and plumbing work is difficult II. Corrosion problem is eliminated and hence corrosion related contamination of water is avoided and life of the pipes increases III. Inner surface of pipes may be made smooth to reduce friction losses, thus saving on electricity bills and conserving energy

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