Which FW-1 kernel flags should be used to properly debug and troubleshoot NAT issues?

Which FW-1 kernel flags should be used to properly debug and troubleshoot NAT issues?

A.
nat, drop, conn, xlate, filter, ioctl

B.
nat, xltrc, xlate, drop, conn, vm

C.
nat, route, conn, fwd, zeco, err

D.
nat, xlate, fwd, vm, ld, chain