What may occur if workflow rules are reevaluated after a field change by afield update?

What may occur if workflow rules are reevaluated after a field change by afield update?
A . A recursive loop potentially results in exceeding organizational limits.
B . Cross-object workflow rules result in re-evaluation after field change.
C . Workflow rules trigger validation rules on field updates.
D . Workflow rules trigger more workflow rules to be re-evaluated.

Answer: A,D