Uh how do you get a little blue box in a sandwich
Answer:
It could be because you where hack. Or there was something wrong with the site that stopped it from saying why it stopped.
“Hexadecimal uses digits that more closely resemble our usual base-10 counting system and it's therefore easier to decide at a glance how big a number like e7 is as opposed to 11100111. Higher information density. With 2 hexadecimal digits, we can express any number from 0 to 255.”
A server can have many definitions, but in this particular case, the answer is A.