Bibliometrics is

1. A

   Function of Library Network

   (a) Function of Library Network. Networks (INFLIBNET, DELNET) share catalogues; bibliometrics is not defined as that function.

2. B

   Information Management Service

   (b) Information Management Service. A service is a delivered activity; bibliometrics is a measurement toolkit used inside such services.

3. C

   Information Management Tool

   (c) Information Management Tool. Bibliometrics counts publications, citations and impact—an analytical tool for managing scholarly information. (c) Official key.

4. D

   Library Service

   (d) Library Service. Circulation or reference is a service; bibliometrics may support it but is not itself “a library service” in this key.

Summary. Official key is (c). Bibliometrics is treated as an information-management tool (publication and citation analysis), not as a network function or a front-desk library service.