Correct Answer: BTo identify credentials in plaintext used to log in to Telnet-managed network switches, a network traffic analyzer should be utilized. Telnet transmits data, including login credentials, in unencrypted plaintext. A network traffic analyzer, also known as a packet sniffer, can capture and inspect the data packets traveling over the network. By examining these packets, the analyzer can identify and reveal the plaintext credentials being transmitted. Tools like Wireshark are popular examples of such analyzers.