A consortium of university libraries and digital archives wants to create a unified discovery portal for their diverse collections. A key requirement is that a user's search for '19th-century cartography' should return relevant maps, books, and journal articles from all participating institutions. Which metadata standard is MOST appropriate for establishing this baseline interoperability?
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A
A custom-built XML schema tailored to cartography.
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B
EXIF (Exchangeable Image File Format) to capture details from scanned maps.
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C
Dublin Core, using its 15 core elements as a common descriptive framework.
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D
MARC (Machine-Readable Cataloging) records from each library's system.