What do you call characters that separate data?

To find which customers have not yet ordered, you would run a(n) ________ query

Fill in the blank(s) with correct word

Stacks are useful data structures for algorithms that work with lists of items in a

A) first in, first out order. B) first in, last out order. C) last in, last out order. D) garbage in, garbage out order. E) None of the above