What are the core elements of a dissertation?

Q. What are the core elements of a dissertation?

1. Introduction; Data Collection; Data Analysis; Conclusions and Recommendations
2. Executive Summary; Literature Review; Data Gathered; Conclusions; Bibliography
3. Research Plan; Research Data; Analysis; References
4. Introduction; Literature Review; Research Methodology; Results; Discussions and Conclusions

Answer: Introduction; Literature Review; Research Methodology; Results; Discussions and Conclusions