Which three heroes must Rogue absorb to defeat Doctor Doom?

Rogue has enough prep time to absorb 3 other mutants/super beings. Who can she absorb to beat Doctor Doom and can she actually beat him?

No Squirrel Girl allowed in this discussion.

Assume the other mutants willfully give their powers to Rogue.

Which three heroes must Rogue absorb to defeat Doctor Doom?
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