What is the output of lexical analyzer?a) A set of RE b) Syntax Tree c) Set of Tokens d) String Character

The output of a lexical analyzer is c) Set of Tokens.

Here's a step-by-step explanation:

1. The lexical analyzer, also known as the scanner, reads the source code (input) character by character.

2. It then groups these characters into sequences called lexemes.

3. Each lexeme is matched with a token. A token is a pair consisting of a token name and an optional attribute value.

4. The token name is an abstract symbol representing a kind of lexical unit, e.g., a particular keyword, identifier, or sequence of input characters denoting a particular operator.

5. These tokens are then passed on to the syntax analyzer (or parser) as output.

So, the lexical analyzer doesn't produce a set of regular expressions (RE), a syntax tree, or a string character. Its main output is a set of tokens.