Welcome to your interview.
The question is on your right: L1 vs L2 Regularization Math. 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.
Explain the mathematical difference between L1 (Lasso) and L2 (Ridge) regularization for Freddie Mac predictive models.