Which of the following are best practices when working with Variables? Note: There are 2 correct answers to this question.

Which of the following are best practices when working with Variables? Note: There are 2 correct answers to this question.
A . Always use a Variable in a rule instead of a compensation element.
B . Avoid using Variables because they increase processing time.
C . Always leave the Variable default assignment field empty.
D . Set a default assignment for all Variables.

Answer: A, D