In the network as shown in the figure, after completing the corresponding configuration on the switch SWA, when the switch SWA receives the data frame from the PCA to access the PCB, it will judge whether to check the MAC address table or the routing table according to it.

In the network as shown in the figure, after completing the corresponding configuration on the switch SWA, when the switch SWA receives the data frame from the PCA to access the PCB, it will judge whether to check the MAC address table or the routing table according to it.
A . VLAN attributes of data frames
B . Destination MAC address of the data frame
C . Source MAC address of the data frame
D . Source MAC address of the data frame
E . The source IP address of the data frame

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Answer: B