问题：

[单选]

如图所示，某局域网采用MSR路由器上连到ISP。如果要在MSR路由器的出接口上实现基于报文的负载分担，则以下哪些配置是必须的？（）

A . MSR-Ethernet1/1]ip fast-forwarding inbound MSR-Ethernet1/2]ip fast-forwarding inbound
B . MSR-Ethernet1/1]ip fast-forwarding outbound MSR-Ethernet1/2]ip fast-forwarding outbound
C . MSR-Ethernet1/1]undo ip fast-forwarding inbound MSR-Ethernet1/2]undo ip fast-forwarding inbound
D . MSR-Ethernet1/1]undo ip fast-forwarding outbound MSR-Ethernet1/2]undo ip fast-forwarding outbound