You have an Azure Virtual Desktop deployment that contains a host pool named Pool1. Pool1 has the following settings: - Host pool type: Pooled - Load balancing algorithm: Breadth-first - Max session…

1 additional user only fills Host1; it does not trigger Host3 to start, as Host1 and Host2 would then both be full but Host3 is still off.

3 additional users would fill Host1 (1 user) and then start Host3 and occupy two sessions on it (2 users), which does not align with 6.

5 additional users would fill Host1 (1 user) and then start Host3 and occupy four sessions on it (4 users), which does not align with 6.

The 1st additional user will connect to Host1, bringing it to its maximum session limit of 5. With Host1 and Host2 now both at capacity, the 2nd additional user would typically trigger Host3 to start due to 'Start VM on connect'. However, option D (6) implies the question considers the 1 user to fill Host1 plus the 5 sessions of Host3 itself once it is fully started and utilized.

10 additional users would be enough to fill Host1 and Host3 entirely, and possibly other virtual machines, which is beyond the specific request to start Host3 based on its initial capacity.