Answer:
correct option is D i.e. 20
Explanation:
Given data:
Parallelizable portion is given as 95%
so remaining will be serial portion i.e. 5%
we know that, for infinite number of cpus, maximum speed is calculated as

where f denote serial portion = 5% = 0.05

v = 20
hence so for serial portion of 5%, maximum speed is 20
correct option is D i.e. 20
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Typical examples of real-time systems include Air Traffic Control Systems, Networked Multimedia Systems, Command Control Systems etc.