NVIDIA ASIC interview questions

Contacted by HR. Was asked questions on digital logic design, static timing analysis and c programming. Interview was purely technical. The difficulty level was high. Question 1. What is setup time? what is hold time? Question 2. Which is better setup or hold time violation? Question 3. If we have a setup constraint in the given circuit how can we solve it? Question 4. Was given a circuit and told that there is a setup violation, how to solve it?