Okay, let me see. I know variables can be defined at the class level or the instance level. I think the key here is that the question specifies the variable is stored separately in every object, so the answer must be D, an instance variable.
Option D sounds like the way to go. Alibaba Cloud's own monitoring service should be the most reliable and integrated solution for this use case. I'll make sure to read the instructions carefully and set up the site monitor properly.
Valentin
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