Multiple choice. Check all that apply: How do Ruby iterators differ from java iterators? A. Unlike Java iterators, Ruby iterators usually avoid the need to use an index variable (e.g., i) inside the body of the iteration. B. Ruby has multiple methods defined over system classes that act as iterators. C. Ruby iterators work "from the outside in" instead of "from the inside out." D. Ruby has an iterator that iterates over both key and value in a hash.