A.They must be declared static
B.They can be declared either static or instance members
C.they must be declares in the same assembly(but may be in different sources files)
D.Extension methods can be used to override existing instance methods
Ans:A&D
B.They can be declared either static or instance members
C.they must be declares in the same assembly(but may be in different sources files)
D.Extension methods can be used to override existing instance methods
Ans:A&D