my answer is Cyber Security. So write the essay accordingly.
do not use passive voice, only active.
focus on the questions and make sure you have completed answer for them.
write in a simple, easy, logical flow way. no complexity.
use end notes only. no foot notes.
write the bibliography.
I suggest the following:
INTRO: go over the definition of national security and cyber security, briefly state the challenges and select the cyber in the thesis statement, briefly go over the reasons, factors and recommendations. In a same logical flow make the main points 1,2 , 3 then the conclusion at the end of the essay.