What platform was used for the sixth and final generation of the Buick Electra?

A. A platform shared with Chevrolet Impala and Pontiac Catalina
B. C platform shared with Oldsmobile 98 and Cadillac Deville
C. B platform shared with Oldsmobile Cutlass and Pontiac Grand Prix
D. D platform shared with Chevrolet Caprice and Pontiac Bonneville
Answer: 