Q: Consider the following statements: The strategy is to assign extra time at critical moments in the project; buffers are added to: 1. activities with no risk. 2. merge activities that are prone to delays due to one or more preceding activities being late. 3. non-critical activities to reduce the likelihood that they will create another critical path. 4. activities that require scarce resources to ensure that the resources are available when needed. Which of the above statements are correct?