Which type of dependency is characterized by the need for one task's deliverables to affect another's success?

The correct answer is that the type of dependency characterized by the need for one task's deliverables to affect another's success is known as Mandatory Dependencies.

Mandatory dependencies are those that are legally or contractually required, or are inherently necessary for the completion of a project. They exist when a specific task must be completed before another task can begin. For example, in a project schedule, if Task A must be completed before Task B can start, this reflects a mandatory dependency. This type of dependency often involves sequences that are dictated by the nature of the tasks themselves or regulatory requirements.

Understanding that some tasks are inherently dependent on the completion of others is crucial in project management and resource planning. In this context, this explains the need for recognizing how the outcomes of certain tasks impact subsequent work, ensuring that dependencies are managed efficiently for project success.

Other options, such as internal, physical, and discretionary dependencies, may describe relationships between tasks but do not specifically identify the essential condition of one task's deliverables directly affecting another's success in the same contractual or necessary way that mandatory dependencies do.