Universal Containers uses In-Day Optimization to optimize a Service Territory schedule during working hours.

When running optimization (Global or In-Day), the engine is allowed to move any appointment that is not "Pinned."

Option C is correct. In Salesforce Field Service, you must explicitly define which statuses are considered Pinned (immovable) during optimization. This is configured in Field Service Settings > Optimization > Logic . If the 'In Progress' status is not selected in the "Pinned Statuses" list, the optimization engine sees that appointment as movable. To improve the schedule, it might unassign the current tech and assign a different one, even though the tech is already on-site.

Ensuring 'In Progress' is "excluded from optimization logic" (Pinned) forces the engine to schedule around that appointment rather than moving it.

Option B refers to "Status Transitions," which controls the lifecycle flow (e.g., New - > Scheduled - > In Progress) but does not control the scheduling engine's permission to move the job.