Porsche's first 4-door car
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Porsche 911 GT
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Porsche 729
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Porsche 911 turbo
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Porsche 989
D
Correct answer
Explanation
The Porsche 989 was Porsche's first 4-door sedan concept developed in the late 1980s, though it never reached production. The 911 GT and 911 Turbo are sports cars, while the 729 option appears to be a distractor - Porsche doesn't have a mainstream model with this designation.