Licensing

Upon acceptance of an article, authors license exclusive rights in their article to Thamar University. This open-access article is distributed under the terms of the Creative Commons Attribution Non-Commercial License (CC BY-NC 4.0) (https://creativecommons.org/licenses/by-nc/4.0/), which permits the reuse, distribution, and reproduction of the article, provided that the original work is properly cited, and the reuse is restricted to noncommercial purposes. Permitted third-party reuse of open-access articles is determined by contacting the Journal Service Team (tujnas@tu.edu.ye).