The MongoDB explain() method does not support which of the following verbosity mode:

Question

Options

• AexecutionStats
• BqueryPlanner
• CcustomExecutionStats
• DallPlansExecution

• A
  4% (1)
• B
  4% (1)
• C
  92% (24)

Explanation

customExecutionStats (option C) is not a real verbosity mode - MongoDB's explain() method only supports three built-in verbosity modes, and this is a fabricated distractor.

Why the others are wrong (i.e., they're all valid modes):

• A. executionStats - Valid. Returns stats on the winning query plan, including documents examined and execution time.
• B. queryPlanner - Valid. The default mode; shows which plan the optimizer selected without actually executing the query.
• D. allPlansExecution - Valid. The most verbose mode; runs all candidate plans and returns stats for each, not just the winner.

Memory tip: Think of the three real modes as a spectrum of "how much work MongoDB does" - queryPlanner (plan only) → executionStats (run the winner) → allPlansExecution (run everything). Anything outside this trio is fake - "custom" is a dead giveaway since MongoDB's explain API has no customization hooks.

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