A technician discovers that the throughput of sales traffic on the primary connection is constantly reaching maximum level, and the sales users are beginning to report slowness while accessing cloud…

QoS (Quality of Service) prioritizes or limits certain traffic types based on policy but does not distribute traffic across multiple physical connections.

Caching engines store frequently accessed content locally to reduce bandwidth consumption - they do not redirect live traffic to alternate WAN links.

Traffic shaping controls the rate and timing of traffic flows to conform to a bandwidth profile - it does not distribute traffic across multiple connections.

Load balancing in a WAN context spreads outbound traffic across multiple available connections using policies or algorithms, preventing any single link from being saturated. By allowing sales traffic to use the secondary connection, the technician is distributing the load across both uplinks, which is exactly what load balancing achieves.