Welcome to your interview.
The question is on your right: Linear Regression With AR(1) Errors. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
How would you deal with linear regression with AR(1) errors?