What file should be edited to make the system aware of newly added library files?

What file should be edited to make the system aware of newly added library files?

A.
/etc/modules.conf

B.
/etc/conf.modules

C.
/etc/ld.so.conf

D.
/etc/ld.so.cache

E.
/etc/LD_LIBRARY_PATH.conf

Explanation/Reference:
Explanation:
ldconfig creates the necessary links and cache to the most recent shared libraries found in the directories specified on the command line, in the file /etc/ld.so.conf, and in the trusted directories (/lib and /usr/lib). The cache is used by the run-time linker, ld.so or ld-linux.so. ldconfig checks the header and file names of the libraries it encounters when determining which versions should have their links updated.

Some files:
/lib/ld.so run-time linker/loader
/etc/ld.so.conf File containing a list of colon, space, tab, newline, or comma spearated directories in which to search for libraries.
/etc/ld.so.cache File containing an ordered list of libraries found in the directories specified in /etc/ld.so.conf