s the statement a​ tautology? a. the statement is not a​ tautology, since it is false for all combinations of truth values of the components. b. the statement is a​ tautology, since it is true for all combinations of truth values of the components. c. the statement is a​ tautology, since there is at least one combination of truth values for its components where the statement is true. d. the statement is not a​ tautology, since there is at least one combination of truth values for its components where the statement is false.