Across the car brands(Audi A4, BMW 3 series, Cadillac ATS, Volvo S60 , which one do you see as having the strongest point of differentiation and why?…

Across the car brands(Audi A4, BMW 3 series, Cadillac ATS, Volvo S60 , which one do you see as having the strongest point of differentiation and why?  Is this a defensible position in the category and what marketing mix tool would you use to defend it?

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