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0. Consider the decision problem 2CNFSAT defined as follows: {Φ|Φ is a satisfiable propositional formula in CNF with at most two literals per clause} For example, Φ = (x1 ∨ x2) ∧ (x1 ∨ x3) ∧ (x2 ∨ x4) is a Boolean formula and it is in 2CNFSAT. The" decision problem 2CNFSAT is
NP-Complete.
solvable in polynomial time by reduction to directed graph reachability.
solvable in constant time since any input instance is satisfiable.
NP-hard, but not NP-complete.
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