a$)$ Describe what the nmap options in the command you just ran perform:

nmap $-$sT $-$n $-$A $-$T$4--$reason $--$open $-$p$1-1000010\mathrm{.}70\mathrm{.}0\mathrm{.}91$

b$)$ How many ports are open?

c$)$ What information from the nmap output seems useful to you and explain why $($how would you potentially use it$)?$