Which of the following descriptions of the business chain is wrong?

In the NSH implementation, the service chain function is implemented by inserting the NSH header into VXLAN packets

In the PBR implementation, the controller delivers PBR diversion policy routes to SFF and SC nodes hop-by-hop through NETCONF

In PBR implementation, the controller delivers filtering and redirection policies to the SC nodes to selectively redirect service traffic

In the NSH implementation, the SF node must support NSH