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The correct answers are C and E .

AgilePM estimation should be:

collaborative,

proportionate,

realistic,

and open to refinement.

Why C is correct

“Allow flexibility and accept uncertainty in estimates that may be refined later.”

This is central to AgilePM. Estimates are expected to evolve as understanding improves. Early estimates are not fixed promises; they are informed forecasts based on current knowledge.

Why E is correct

“Use team-based estimation techniques as collective knowledge will improve accuracy.”

This also aligns strongly with AgilePM. Estimation benefits from the combined knowledge of the team because different people understand different aspects of the work, risks, and dependencies.

Why the other options are incorrect

A is too detailed and heavy for the likely stage and context.

B is wrong because Planning Poker supports relative/team-based estimation, but not “precise” early certainty.

D is contrary to agile estimation. Estimates are not meant to be fixed and artificially precise.

So the best answers are C, E .