The correct command to configure the source IP address on switch1 for mirroring traffic to a packet sniffer located on switch2 is option B, "monitor erspan origin ip-address 209.165.200.225". This command sets the origin IP address for the Encapsulated Remote SPAN (ERSPAN) session, which allows traffic from a source port on one switch to be monitored on a destination port on another switch across an IP network. References: * Cisco Nexus 9000 Series NX-OS System Management Configuration Guide * Cisco Data Center Core Technologies (DCCOR) study materials