Which one is the most specific definition of NP$-$Complete Problem?Efficiently verifiable by a deterministic Turing machine in polynomial time.At least as hard as the hardest problems in NP$.$ No known polynomial$-$time algorithm exists for solving them.Hardest problems in NP$.$ If a polynomial$-$time algorithm exists for one NP$-$Complete problem, it implies a polynomial$-$time algorithm exists for all NP problems.Efficiently solvable by a deterministic Turing machine in polynomial timeCan be verified in polynomial time by a deterministic Turing machine