This looks like a pretty straightforward multiple-choice question on device-level protection schemes for SDH products. I'm going to carefully read through the options and think about which ones make the most sense.
As an SDH expert, I can confidently say that the correct answers are A and B. C and D are just attempts to confuse the test takers. Come on, 'system dashboard protection'? Really?
Power protection and cross-connect and timer board protection sound like the right answers here. I'm not sure what 'system dashboard protection' or 'TPS protection' even are.
Joanne
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