Users have complained recently about their experience with a collaboration tool that is being used on different international locations on your network. The collaboration tool uses IP precedence of…

Users have complained recently about their experience with a collaboration tool that is being used on different international locations on your network. The collaboration tool uses IP precedence of "4" for all the traffic that runs over your network. Upon investigating the problem, you noticed that the tool worked fine most of the time. You observed that video frames would freeze occasionally for a short time, and some collaboration features had slow responses. The IT department has been engaged, and they believe that the problem is with the network transport. You tried end-to-end extended pings by using the ToS value of 128 and noticed a high round-trip time on some of the ping packets. To the best of your knowledge, all the routers in the forwarding path are distributed architecture, hardware- based forwarding devices, and the entire path is QoS-enabled. What should be the next three steps in identifying the root cause? (Choose three.)