**Acknowledgements**

This is to happily express my sincere thanks and appreciation to the following for their support and guidance throughout the chapter writing. I would like to thank my friends who stood beside me and helped me pursue my work. This chapter is dedicated to my parents, without whom, after the blessings of Allah, all this work would not be possible. They have been a source of endless love, encouragement, and support. They believed in me and in whatever decision I took and are proud of me on whatever achievement I may have.

## **Thanks**

Your support means a lot of thanks.
