An Online Public Access Catalogue (OPAC) is a digital interface to a library's bibliographic database, enabling users to search holdings by various fields. It replaces traditional card catalogues and provides quicker, more flexible access to collection information. Modern OPACs may be accessible via the web from outside the library premises. Therefore, the system described in the stem is an OPAC.
Option A:
Option A is correct because the full form "online public access catalogue" is standard in library science, and the functions listed match those offered by OPACs.
Option B:
Option B, online personal article collection, is not a recognised term and would suggest a private store rather than a library's public catalogue.
Option C:
Option C, offline print accession card, refers to older manual cataloguing systems and does not involve computer interfaces.
Option D:
Option D, open password authentication check, sounds like a security procedure rather than a tool for searching library collections.
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