Explain the purpose of YANG and how it is used in network management. Which protocol$($s$)$ must rely on YANG? Which protocol$($s$)$ may rely on YANG? Define the term "module" in YANG, and explain how modules are used in YANG data modeling. What is the difference between a leaf and a leaf$-$list in YANG, and when would you use each of these data types? Explain the purpose of the "choice" statement in YANG, and give an example of how you would use it to define data models. What is the difference between a "container" and a "list" in YANG data modeling, and when would you use each of these data types? Explain the purpose of the "import" statement in YANG. What is the purpose of the $$include$$ statement in YANG? How do the two differ?