Question: What does the ' - - top - ports 2 0 ' option do when combined with the nmap command? It limits the scan to

What does the '--top-ports 20' option do when combined with the nmap command?
It limits the scan to 20 seconds for network efficiency
It scans the 20 most common open ports
It scan the first 20 IP addresses of a subnet
It limits the scan to 20 packets to avoid network Intrusion Detection Systems (IDS)

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