I've got this one! The answer is definitely C. You use the universal device poller to define custom statistics and add them to the existing node. Easy peasy.
Okay, let me see. If the node doesn't have the default value polled, then I'm guessing we can't just update the MIB database (D). And custom statistics can't be added to an existing node (B), so that leaves A or C. I'm leaning towards C, but I'll double-check my notes just to be sure.
I think the answer is C - define custom statistic with universal device poller (UnDP). That seems like the most straightforward way to add new statistics to an existing node.
I'm pretty sure B is not the right answer. Custom statistics can definitely be added to an existing node, it's just a matter of setting it up properly.
Option C seems like the way to go. Defining a custom statistic with the Universal Device Poller should let me add the new UPS battery status without having to create a whole new device poller.
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