A technician is having problems sending a notification from a server. The technician suspects the firewall may be blocking traffic. Which of the following clients can be used to confirm the…

Traceroute works by sending packets with incrementing TTL values and recording each hop's response, building a map of the full network path. If a firewall is blocking traffic, packets will fail to advance past a specific hop, pinpointing the firewall as the obstruction and confirming the technician's suspicion with clear path-based evidence.

Sendmail is a Mail Transfer Agent used to compose and relay email messages, not a network diagnostic tool capable of revealing where in a path a firewall is dropping traffic.

Nslookup performs DNS hostname-to-IP resolution and provides no information about the network path packets travel or whether a firewall is blocking traffic along that path.

Telnet initiates an interactive TCP session to a specific host and port and can test whether a single port is reachable, but it does not trace the full multi-hop path or identify where along the route a firewall is intercepting traffic.