A user reports that one of their critical programs no longer functions after a recent router upgrade in the office. A network technician is called in to troubleshoot the issue and documentation shows that the software needs full open connections over ports 558, 981, and 382 in order to function.
Which of the following tools could the technician BEST use to troubleshoot this issue?
A. NET USE
B. IPCONFIG
C. TRACEROUTE
D. TELNET
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