When the margin of a member of a futures exchange is insufficient, the member shall make up the margin within the time specified by the futures exchange. Item d means to increase the margin, but it is wrong to reduce the position, but the margin gap has not been made up. The situation of increasing the deposit should be near the delivery date, when there are holidays and the like. There is only insufficient margin here, so the key point is to increase margin. If you can't replenish in time, you can only close your position yourself, otherwise you will be forced to close your position by the exchange at your own risk.