You will deploy Azure Virtual Desktop host pools with load balancing and autoscaling to meet departmental requirements (minimize cost). What is the minimum number of host pools required?

The minimum number of host pools required is three. Each department will need its own host pool to ensure proper isolation and management of resources, especially when considering different application requirements, security policies, or user groups. While a single host pool can be scaled, it would not meet the implicit requirement of departmental separation often associated with minimizing cost and managing distinct user needs. Two host pools would still leave one department without its own dedicated pool. Four host pools would be excessive if there are only three departments, leading to unnecessary overhead.