Which one of the following is TRUE at any valid state in shift-reduce parsing?

GATE · 2015 · CS · Set 1 · Computer Science & IT

1. A.

   Viable prefixes appear only at the bottom of the stack and not inside

2. B.

   Viable prefixes appear only at the top of the stack and not inside

3. C.

   The stack contains only a set of viable prefixes

4. D.

   The stack never contains viable prefixes

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