The analysis and conclusions drawn by Mad Jock are correct for a blocked static port.
As RTN11 has said, option 1 would be correct if the question had specified a blocked Pitot source.
Methods like "COPS DUO" are OK provided simply want to pass exams and have no wish to understand anything at all about how your aircraft and its systems function.
Last edited by keith williams; 13th May 2013 at 22:27.