Hmm, I'd go with B, C, and D. Checking the MODEM config, traffic, and gateway connectivity should give you a good idea of what's going on. A is too specific, in my opinion.
A and B seem like good options, but I think C and D are more comprehensive in terms of diagnosing the problem. You really need to look at the traffic and connectivity to the gateway.
I think the correct answers are B, C, and D. Checking the MODEM configuration, querying the traffic, and pinging the gateway are all important steps in troubleshooting xDSL issues.
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