If the D_A = 5 years and D_L = 3 years and liabilities equal 90 per cent of the total assets, then the FI could immunise the balance sheet in the following ways except

a.

reduce D_A to equal kD_L

b.

increase D_A to equal kD_L

c.

reduce D_A and increase kD_L until they equal

d.

adjust k and D_L until KD_L equals D_A