12. Assume that we will use multi-core processor to solve a problem in parallel and 95% of the program code is parallelizable. If we want to get a speedup of 8, how many cores are needed at least?
(A)9
(B) 10
(C)11
(D) 12
(E) 13

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統計： A(1), B(0), C(0), D(0), E(0) #2789114