The management of port-scanning that can catch one unaware. If scans are taking too long to complete or obvious ports are missing from the scan, various times of the day are used to run scans. Which…

The management of port-scanning that can catch one unaware. If scans are taking too long to complete or obvious ports are missing from the scan, various times of the day are used to run scans. Which one of the following scanned timing options in NMAP's scan is useful across slow WAN links or to hide the scan?