Which one of the following is not an important addition made to the Basel Accords by Basel III in $2010?$

It supplements capital requirements based on risk$-$weighted assets with restrictions on leverage.

It introduces three buffers over and above capital requirements itself.

It adds a liquidity requirement that compels banks to hold a quantity of high$-$quality liquid assets.

It ends the too$-$big$-$to$-$fail problem.