Banks hold reserve to cover the amount of withdrawals. It also may happen that banks don't think that there are good enough opportunities to park their funds, and thus they can keep the amount as reserve i.e, they don't loan it out.
However, it's not true that every bank loan must be matched by an equal amount of reserves. Holding reserves don't serve any purpose of safeguarding against inflation as the value of idle money which is lying with bank depreciates with inflation.
Therefore, Option 1 and 3 are correct.
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