Which of the following statements is false? a. Top-down parsers are LL parsers where first L stands for left-to-right scan and second L stands for a leftmost derivation. b. (000)* is a regular expression that matches only strings containing an odd number of zeroes, including the empty string. c. Bottom-up parsers are in the LR family, where L stands for left-to-right scan and R stands for rightmost derivation. d. The class of context-free languages is closed under reversal. That is, if L is any context-free language, then the language LR={WR:wϵL} is context free.

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