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Answer

Correct Option is recorded, expansion

Solution: The correct pair of words for the given blanks is ‘recorded, expansion’. All other pairs of words are either contextually meaningless or grammatically incorrect.
expansion means the action of becoming larger or more extensive.
augment means make (something) greater by adding to it; increase.
enlist means engage (a person or their help or support).
vulnerable means exposed to the possibility of being attacked or harmed, either physically or emotionally.

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