Which of the following are barriers to entry that can give rise to a monopoly? (i) a patent giving exclusive right to manufacture a new electronic device (ii) a single firm buys all the rights to mine iron ore in Australia (iii) a single firm can produce at lower cost than several firms
A. (i) and (ii) only
B. (ii) and (iii) only
C. (i) only
D. (i), (ii), and (iii)