Which of the Following Statements About Leverage Ratios Under Basel

Which of the following statements about leverage ratios under Basel III is correct?

A) The leverage ratio is the ratio of the bank's Tier 1 Capital to total assets of the bank, excluding its off- balance sheet exposures and derivatives.
B) The purpose of introducing a leverage ratio is to avoid the build-up of excess leverage that could potentially lead to a "credit crunch" in stressed conditions.
C) The leverage ratio under Basel III must be higher than 4%.
D) The leverage ratio is the ratio of the bank's Tier 1 and Tier 2 Capital to total assets of the bank, including its off-balance sheet exposures and derivatives.