What is worldcat?
a. an international database of libraries and their collections
b. an internet archive that serves as one stop spot for research
c. a database of more than 72,000 documents for education professionalals
d. a source for library and information professionals

Im pretty sure its

D.

Explanation:

WorldCat lets you search the collections of libraries in your/a community WorldCat grows every day because of librarians and other information professionals.

A. An international database of libraries and their collections

Explanation: An international database of libraries and their catalogs that have registered with WorldCat

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