CAPM Practice: Demonstrate an understanding of project management planning

A milestone represents a significant point or event in the project and has zero duration—it marks achievement of a deliverable or phase. A task duration represents the actual time period required to complete work activities.

**Why not A:** Milestones do not require resources — they represent points in time with zero duration, not work activities. Tasks with durations consume resources to perform work, but milestones simply mark significant achievements or events.

**Why not B:** A milestone is not inherently part of the critical path, and task duration does not determine float. Float is determined by the relationship between an activity's earliest and latest possible start or finish dates in the schedule network, not by its duration alone.

**Why not D:** Neither milestones nor task durations are defined by specific units of measurement. Milestones have zero duration regardless of the time unit used, and task durations can be measured in any time unit (hours, days, weeks, or months) depending on the project context.