How would I go about answering part a of this mock exam question

hope you're all doing fine. I was going through my mock exam paper and bumped into a question that threw me off a little bit. The question is as follows:

'You have been asked to create a shared calendaring application that runs on Web technologies. The application must support user registration, the creation of activities and the sharing of those activities. Any user that shares an activity may edit it or add notes to it. You must write a short technical report outlining a solution that uses a Node JS server and full stack JavaScript implementation.

Your report is to be split into 3 sections, as follows:

a) A specification of your proposed solution, demonstrating that you can apply your knowledge of both software architecture and of frameworks to the problem.

b) A critical evaluation of JavaScript as a full-stack technology for Web application development.

c) A discussion of those features of Node JS that make it a suitable scalable deployment platform for this type of application.'

I have been able to answer part b and c as they are relatively straightforward, just unsure how I would tackle part a. Any thoughts or ideas? Just practice for my upcoming exam which is next week.