During the construction of a public park, the contractor discovers a subsurface rock ledge that was not identified in the geotechnical report, preventing the installation of a precast concrete retaining wall as designed. The landscape architect determines a different type of retaining wall is required. Which of the following documents is the formal instrument used to authorize this change in scope and associated costs?
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A
Addendum
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B
Request for Information (RFI)
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C
Construction Change Directive (CCD)
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D
Change Order