Routers operate at layer _____. LAN switches operate at layer _____. Ethernet hubs operate at layer _____. Word processing operates at layer _____.
A. 3, 3, 1, 7
B. 3, 2, 1, none
C. 3, 2, 1, 7
D. 3, 3, 2, none
E. All of the above
Answer: Option B
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