Users are reporting that all of a sudden some of the files stored on the remote file server share are
becoming corrupted and cannot be opened. A technician is dispatched to the server room to
troubleshoot. The technician verifies that no changes to the network infrastructure occurred
recently. Which of the following tools is MOST likely to reveal why files are becoming corrupted?

A.
Environmental monitor

B.
OTDR

C.
Cable tester

D.
Punch down tool