If Central Bank A cares only about keeping the price level stable and Central Bank B cares only about keeping output at its natural level, then in response to an exogenous decrease in the velocity of money:.a. Both Central Bank A and B should increase the quantity of moneyb. Central Bank A should increase the quantity of moneyc. Central Bank A should keep the quantity of money stable whereas Central Bank B should increase itd. Both Central Banks A and B should keep the quantity of money stable