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Question

If the lines a¯¯¯z+¯¯¯az+b=0 and c¯¯¯z+¯¯cz+d=0 are mutually perpendicular, where a and c are non zero complex numbers, while b and d are real numbers, then

A
a¯¯¯a+c¯¯c=0
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B
a¯¯c is purely imaginary
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C
arg(ac)=±π2
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D
a¯¯¯a=c¯¯c
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