The last one (you wrote b but I think you meant e?) I think.
Todoroki here-
Wow, I've heard of it and played it but I never made to that level. I got mad and gave up on that game. Sorry Deku
Answer: Nominal level is the operating level at which an electronic signal processing device is designed to operate. ... It is important to realize that the measured level is a time average, meaning that the peaks of audio signals regularly exceed the measured average level.
Explanation:
