What task constraint applies when a Project Manager manually selects the Planned Completion Date?

The correct answer is "Must finish on." When a Project Manager manually selects the Planned Completion Date in Adobe Workfront, they are essentially specifying a fixed deadline for when the task must be completed. This becomes a crucial constraint because it locks the task into a specific timeline, indicating that all associated activities should align to ensure the task is completed by that specified date.

Setting a Planned Completion Date creates a commitment to that date, thereby establishing clear expectations for project progression and resource allocation. This is particularly important for project planning and scheduling as it helps prevent slippage in timelines and ensures that all team members are aware of the urgency tied to the task. The focus here is on meeting the deadline rather than just aiming to complete the task as early as possible or by a flexible timeframe.