请问B选项的后半句是什么意思？

问题如下：

Financial market utilities use several risk mitigation actions to reduce intraday settlement risk, exclude for which?

选项：

Intraday margin call, requiring additional collateral from the participant to changes in its risk and collateral positions.

Participant to pre-fund its account and not permit it to run intra-day overdrafts.

Require a participant to post additional collateral or post performance bond from a third-party institution to backstop its credit risk.

Monitor participants’ key vulnerabilities and their sensitivity to external factors.

解释：

考点：对Risk Management, Measurement and Monitoring Tools for FMUs的理解

答案：D

解析：

ABC三个选项属于Financial market utilities，降低intraday settlement risk的方式，D选项错误。