The Primary Difference Between Basel I and the Proposed Basel

The primary difference between Basel I and the proposed Basel III in calculating risk-adjusted assets is

A) that Basel II considers OBS assets.
B) the use of only three weight classes rather than four classes.
C) a heavier reliance on the use of ratings by external credit rating agencies for the assignment of assets to weight classes.
D) All of these.
E) that Basel II considers OBS assets, and a heavier reliance on the use of ratings by external credit rating agencies for the assignment of assets to weight classes.