单选题Refer to the exhibit.HostA cannot ping HostB.Assuming routing is properly configured,what could be the cause of this problem?（）AHostA is not on the same subnet as its default gatewayBThe address of SwitchA is a subnet addressCThe Fa0/0 interface on RouterA is on a subnet that cannot be usedDThe serial interfaces of the routers are not on the same subnetEThe Fa0/0 interface on RouterB is using a broadcast address
单选题
Refer to the exhibit.HostA cannot ping HostB.Assuming routing is properly configured,what could be the cause of this problem?（）
A
HostA is not on the same subnet as its default gateway
B
The address of SwitchA is a subnet address
C
The Fa0/0 interface on RouterA is on a subnet that cannot be used
D
The serial interfaces of the routers are not on the same subnet
E
The Fa0/0 interface on RouterB is using a broadcast address
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