单选题Which layer of the OSI reference model uses the hardware address of a device to ensure message delivery to the proper host on a LAN?（）AphysicalBdatalinkCnetworkDtransport
单选题
Which layer of the OSI reference model uses the hardware address of a device to ensure message delivery to the proper host on a LAN?（）
A
physical
B
datalink
C
network
D
transport
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解析：
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