Which of the following describes a handle (as a...

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

(A) It is the position in a sentential form where the next shift or reduce operation will occur

(B) It is non-terminal whose production will be used for reduction in the next step

(C) It is a production that may be used for reduction in a future step along with a position in the sentential form where the next shift or reduce operation will occur

(D) It is the production p that will be used for reduction in the next step along with a position in the sentential form where the right-hand side of the production may be found

Hint: 

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