Let R = {(a, a),(a, b), (b, b),(a, c), (c, c)} be a partial order relation on Σ= {a,b,c}. Let ≤ be the corresponding lexicographic order on Σ, the set of all finite strings over Σ. Which of the following is true? Select one: O a. abbac ≤ abbab O b. abbac ≤ abbaac O c. bc ba O d. O e. abbaaacc = abbaab abbacs abb

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