Assume that a multiprocessor has 12 processors. Based on an existing program that runs on one processor, a parallel program is written to run on this multiprocessor. Assume that the workload of the parallel portion of the program can be evenly distributed over all processors. Use Amdahl's Law to determine s, the fraction of code that must be executed sequentially, that would allow a speedup of 4.2.

0.1 < s < 0.2

0.2 < s < 0.3

0.8 < s < 0.9

0.9 < s < 1.0