Final answer:
Expressions A and D are completely factored because they have factored out the greatest common factor, leaving a binomial that cannot be factored further.
Step-by-step explanation:
The question focuses on identifying which expressions are completely factored. To verify if an expression is completely factored, we must ensure that there are no common factors that can be further factored out. We will address each option given.
Therefore, the expressions that are completely factored are A and D.