Hmm, I was leaning towards A) until I read these other responses. Now I'm convinced B) is the correct answer. The other options just seem way off the mark.
C) Details the completed execution of the winning plan as a tree of stages? That's way too complex for a simple totalKeysExamined field. I'm sticking with B) - it just makes the most sense.
D) Number of documents scanned? Seriously? That's way too obvious. I'm going with B) - the number of index entries scanned sounds like the most relevant information provided by the totalKeysExamined field.
A) seems logical, but I think B) is the correct answer. The totalKeysExamined field should indicate the number of index entries scanned, which is more relevant for understanding the query performance.
Caitlin
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