3. [16 pts total] Parsing Algorithms 3a. [6 pts] What does a parsing algorithm do? (Yes, it parses. Now give me a better answer.) 3b. [3 pts] How efficient are the parsing algorithms that are used in practical compilers? Express your answer using standard notation or terminology for specifying efficiency. 3c. [7 pts] We wrote a lexer as a state machine with no significant storage other than the current state and lexeme. A parser is virtually never written using this method. Why not