4 inputs to mux#1, another 4 inputs to mux#2, 2 other inputs plus o/ps of mux#1 and mux#2 are inputs to mux#3

There's a lot of elements to typically cover in these questions, clarifications, scoping, making sure you're answering the actual question the interviewer is looking for you to answer, etc. Could be worth doing a mock interview with one of the Prepfully Nvidia Senior Verification Engineer experts... they've worked in the role so they clearly know how to get through the interview. prepfully.com/practice-interviews