Software engineering help

I have couple question I want them answered

11. (6 points) If your application is open to the internet and has potentially new security threats, what software model would you choose and why?

12. (6 points) Name techniques for estimating the time needed to complete an item on the product backlog

15. (5 points) When developing hardware or software, how would you best address unexpected costs and performance issues (what type of software methodology and at what stages?).

16. (5 points) If your team is reusing existing modules in your software development, what stage of software engineering would be best to address potential issues and why?

 

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