Which of the following describes a handle (as applicable to LR-parsing) appropriately?

• A. Position where next reduce or shift operation will occur
• B. The next step has use of Non-terminal for reduction
• C. Used for reduction in a coming-up step along with a position in the sentential form where the next shift or reduce operation will occur
• D. Used in the next step for reduction along with a position in the sentential form where the right hand side of the production may be found