0.0.0.0:443 means the service is bound to all available IPv4 interfaces on the system.
LISTEN indicates the service is actively waiting for incoming connection requests.
Therefore, this output confirms that a service (commonly HTTPS/443, such as the BIG-IP Configuration Utility or an application listener) is actively listening on all interfaces , making B the correct answer.
Why the other options are incorrect:
A would show 127.0.0.1:443 if it were loopback-only.
C is incorrect because LISTEN explicitly indicates readiness to accept connections.
D is unrelated; standby state does not affect socket binding shown by netstat.
Hence, the correct answer is B .
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