Which of the following statements istrueabout comparative advantage?

Comparative advantage exists whenever one person, firm, or nation can do something at higher opportunity costs than some other individual, firm, or nation.

Comparative advantage is interesting theoretically, but it is not relevant when evaluating real-world economic conditions.

Low income countries cannot possibly have a comparative advantage in the production of any good or service because of the relatively low literacy rate.

Comparative advantage exists whenever one person, firm, or nation can do something at lower opportunity costs than some other individual, firm, or nation.

Only technologically advanced economies can have a comparative advantage in the production of a good or service.