During a penetration test, a tester discovers that a router ACL permits inbound Telnet (port 23) from any source. What is the primary security risk?
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A
Telnet traffic is encrypted but slow
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B
Telnet transmits credentials in plaintext, enabling credential interception
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C
Telnet is blocked by most firewalls automatically
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D
Telnet uses a non-standard port that is hard to scan