Explanation:

- Effectiveness is about reaching or achieving desired outcomes.

- Option 1: Doing the right task — This means focusing on activities that actually matter.

- Option 2: Completing activities — Not all completed activities contribute to effectiveness, unless they align with goals.

- Option 3: Achieving goals — Effectiveness is primarily measured by achieving set goals.

- Option 4: All of the above — While completing activities is not always linked to effectiveness, both doing the right task and achieving goals are fundamental.