Determine the accurate chronological sequence for the formal authorization of the following sovereign milestones: Event W: Formal adoption of the National Anthem Event X: Legislative ratification of Commonwealth membership Event Y: Formal adoption of the National Flag Event Z: Formal adoption of the National Emblem
1. Event Y occurred prior to Event X.
2. Event W and Event Z were authorized simultaneously on Republic Day.
3. Event X was the final milestone achieved before the Constitution commenced.