The DuPont identity can be used to help a financial manager determine:

I. The degree of financial liquidity used by the firm.

II$.$ The operating efficiency of the firm.

III. The efficiency of the firm's assets.

IV$.$ The rate of return earned by the firm's equity.

II$.,$ III. and IV$.$ only.

$1.,$ II$.,$ and III. only.

I., II$.,$ III. and IV$.$

III. and IV$.$ only.