A) $ b=0,c=0 $
B) $ b=0,d=0 $
C) $ a=0,c=0 $
D) $ a=0,d=0 $
Correct Answer: B
$ a+ib>c+id $ , it is defined if and only if imaginary parts are equal to zero. Therefore $ ib=id=0 $ Þ $ b=d=0 $ $ (\because i\ne 0) $
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