how to know what options were built into kernel

I am trying to see if the PACKETFILTER option was built into my running ker=
nel.=A0 =0AUnder /sys/conf I see several kernel config files.=A0=A0The one =
that is my HOSTNAME, =0Adoes have "options PACKETFILTER", but how can I ext=
rapulate this from =0A/usr/sys/HOSTNAME/vmunix (i.e./vmunix) to actually kn=
ow it's in the kernel?=0A=0AThanks for the help,=0A=0ARich=0A=0A=0A