Which of the following statement (s) related to the Sustainability is true? I. It refers to a process or state that can be maintained indefinitely. II. Natural resources must use in ways that do not create ecological debts by over exploiting the carrying and productive capacity of the earth. III. A minimum necessary condition for sustainability is the maintenance of the total natural capital stock at or above the current level.

Select one:

a. I, II and III

b. Only II

c. Only II and III

d. Only I