Answer:
I and II only
Step-by-step explanation:
Tier 1 capital is the core measure of a bank's financial strength from a regulator's point of view. It is composed of core capital, which consists primarily of common stock and disclosed reserves (or retained earnings) —that appears on the bank's financial statements, but may also include non-redeemable non-cumulative preferred stock.
Tier 1 capital is the assets the bank holds in its reserves in order to keep it functioning through all the risky transactions it performs, such as trading/investing and lending. Tier 1 capital includes common stock, retained earnings, and preferred stock.
Thus, Tier I (core) capital includes common stockholders' equity and retained earnings among the options.