Your question is Thread vs Process. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Tell me the difference between threads and processes.
Explain the distinction in terms of address space, operating-system resources, scheduling, communication, failure isolation, and security. Include when you would choose each model and how you would verify the relevant isolation and concurrency properties.