If four sides of a quadrilateral ABCD are tangential to a circle, then

Hi, I have a question and I hope anyone could answer it:

If four sides of a quadrilateral ABCD are tangential to a circle, then 

A. AC + AD = BD + CD 

B. AB + CD = BC + AD 

C. AB + CD = AC + BC 

D. AC + AD = BC + DB

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