26. 貼現政策(discount policy)可以透過影響__________的數量以及__________來改變貨幣供給。(A)超額準備(excess reserves)；貨幣基數(B)超額準備(excess reserves)；貨幣乘數(C)借入準備(borrowed reserves)；貨幣基數(D)借入準備(borrowed reserves)；貨幣乘數