Timing Nmap Scans to Prevent Detection

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Q: Steve B. is a black hat and wishes to run a port scan on a machine he is attacking to try to find some open ports and other valuable information. He decides to use the nmap command to execute his scan. Because he is worried that the admin may be running PortSentry in order to block any scans, he will slow the scan downs so that they are less suspicious. What nmap options can he use to do this?

a. nmap -sS -PT -PI -O -T1 <ip address>

b. nmap -sF -P0 -O <ip address>

c. nmap -sO -PT -O -C5 <ip address>

d. nmap -sF -PT -PI -O <ip address>

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