Answer:
Central bank guideline the cash supply are as per the following:
Central bank can adjust the cash supply by purchasing and selling of securities in open market activity. Consequently, purchasing of securities builds cash supply and selling of securities diminishes cash supply.
In this way, by purchasing and selling securities through open market activities.
It can change cash supply by setting save prerequisite. Hence, ascend for possible later use prerequisite lessens cash supply and the other way around.
In this way, by setting hold prerequisites.
By changing discount rate, it can adjust the credit add up to bank and thus cash supply.
In this way, by setting the financing cost charged by save banks for credits to part banks (the discount rate)
In this way, the right answers are 2, 3 and 5