What is the correct command to observe the Sync traffic in a VRRP environment?

In a Virtual Router Redundancy Protocol (VRRP) environment, the correct command to observe sync traffic is focused on the specific multicast address used by VRRP for communication between the routers. The multicast address 224.0.0.18 is designated for VRRP traffic.

Using the command to accept traffic destined for this address allows the administrator to monitor the VRRP packets, which are crucial for understanding the state and syncing of routers participating in VRRP. This is particularly important for troubleshooting or verifying the health and operational status of the VRRP configuration.

The other options may not target the proper multicast address or may not conform to the necessary structure for monitoring VRRP traffic effectively. Therefore, capturing traffic to the address 224.0.0.18 is the precise approach to observe VRRP sync traffic.