When high-bandwidth services likevideoconferencingare introduced, two primary factors may degrade performance: * Incorrect QoS Settings (E):QoS (Quality of Service) is used to prioritize traffic. If not configured correctly, critical services like video may not get the necessary bandwidth and prioritization. * Network Congestion (F):Video services consume large amounts of data. If the network doesn't have sufficient bandwidth or is not segmented properly, congestion will slow down all services. * DNS misconfiguration (A)would affect name resolution, not bandwidth. * Malware (C)could degrade performance, but is not tied to the described scenario. * Outdated software (D)may affect performance in some cases, but not directly linked to network congestion in this case. * Inadequate network security (B)isn't likely to cause general slowness related to video traffic. #So, the most likely culprits areE. Incorrect QoS settingsandF. Network congestion.