what PCI devices can be seen, without querying the kernel?

What command should be used to find out what PCI devices can be seen, without querying the
kernel?

A.
lspci -v

B.
lspci -s

C.
lspci -x

D.
lspci -b

E.
lspci -p

Explanation:
-b Bus-centric view. Show all IRQ numbers and addresses as seen by the cards on the PCI bus instead
of as seen by the kernel.