Which of the following functions are performed by the Hong Kong Monetary Authority?
(1) maintaining the stability of the linked exchange rate
(2) supervising the liquidity position of the private banking institutions
(3) determining the market interest rate in Hong Kong
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. (1), (2) and (3)