问题如下：
In the futures market, how is the margin account between a retail trader and his/her broker managed differently from that between a CCP member and the CCP?
选项：
解释：
In the case of a retail trader, there is an initial margin and a maintenance margin. The margin account balance is adjusted each day to reflect gains and losses. If the balance in the margin account falls below the maintenance margin level, the trader is asked for funds to bring the balance up to the initial margin level. For the member of an exchange, the maintenance margin and the initial margin are effectively the same.
这题答案内容在讲义上吗？？？
