谁帮我看一道思科CCNA的题目?

谁帮我看一道思科CCNA的题目?
The networks connected to router R2 have been summarized as a 192.168.176.0/21 route
and sent to R1.Which two packet destination addresses will R1 forward to R2?(Choose two.)
还有一张图,图的意思大概是这样的,两台路由R1和R2相连,R1连着一个其他的网络云,那R2上面有多个接口,就如题说的,R2上划分了多个网段
A.192.168.194.160
B.192.168.183.41
C.192.168.159.2
D.192.168.183.255
E.192.168.179.4
F.192.168.184.45
希望能给出一个详细的分析步骤,