Question: What does it mean for a problem to be NP - complete? a . There is no efficient ( polynomial time ) algorithm for the

What does it mean for a problem to be NP-complete?
a. There is no efficient (polynomial time) algorithm for the problem
b. The problem is easy to solve in parallel
c. The problem is in NP and every problem in NP can be reduced to this problem in polynomial tine
d. The problem is in NP and this problem can be reduced to every other problem in NP in polynomial time

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