During the bidding phase for a public park project, a landscape architect issues an addendum. What is the primary purpose of this document?
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A
To negotiate the final contract price with the selected bidder.
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B
To formally award the construction contract to the lowest responsible bidder.
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C
To modify or clarify the bidding documents before the bid submission deadline.
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D
To approve a contractor's substitution request after the contract has been signed.