12. Recal that an opaque predicate is a "conditional" that is actually not a conditional. That is, the conditional always evaluates to the same result, but it is not obvious that this is the case. a. Why is an opaque predicate a useful defense against reverse engineering attacks? b. Give an example-different from that given in the text-of an opaque predicate based on a mathematical identity c. Give an example of an opaque predicate based on an input string. 12. Recal that an opaque predicate is a "conditional" that is actually not a conditional. That is, the conditional always evaluates to the same result, but it is not obvious that this is the case. a. Why is an opaque predicate a useful defense against reverse engineering attacks? b. Give an example-different from that given in the text-of an opaque predicate based on a mathematical identity c. Give an example of an opaque predicate based on an input string