Which of the following statements is correct?

Question 7 options:

a. The concept of bound tariffs is a cornerstone of the world trading system and was first applied after the WTO was formed in 1995.

b. The most-favoured-nation rule requires that tariffs be applied equally to all member countries without exception.

c. Under the national treatment rule, once a good or a service is legally present in a country, it must receive the same treatment as a domestic good or service.

d. All of the statements above are correct.

e. None of the above statements is correct.