I am writing a case analysis on -Building a "Backdoor" to the Iphone: An Ethical Dilemma"

can you help me with these questions? third question is the most important.

1) what dilemmas did Tim Cook face?

2) what were Tim Cook's main responsibilities, that would have influenced his decision to refuse to succumb to US government pressure to build a backdoor to the Iphone?

3) What should Tim Cook have done? What would you do if you put yourself in Tim Cook's shoes? Provide justification)