Final answer:
Disabling Shazzam cluster support in a load balancer configuration with multiple mid servers results in reduced scalability and performance because the servers won't efficiently balance the load for data discovery tasks.
Step-by-step explanation:
If Discovery is configured with 3 mid servers in a load balancer cluster with Shazzam cluster support disabled, the best description of what will happen is D) Reduced scalability and performance in data discovery. Without the support for Shazzam clustering, which is designed to optimize discovery across multiple mid servers, the system cannot efficiently distribute the workload. This means that even though there are multiple mid servers available, they won't have the clustering logic to effectively balance the load and work together, potentially resulting in less efficient use of resources and slower discovery times.