During the compilation process, "Lexical Analysis" is the step that:

• A. Checks for correct bracket placement
• B. Separates the code into meaningful pieces called tokens
• C. Resolves external references
• D. Produces the final .exe file

Answer: (B)

Lexical analysis is the first phase of the compilation process, where the source code is transformed from a stream of characters into a more manageable structure. During this phase, the code is divided into tokens, which are the smaller, meaningful elements of the programming language, such as keywords, operators, identifiers, and literals. This tokenization is crucial because it allows the parser, which operates in the next phase of the compilation process, to analyze the syntactic structure of the code more effectively.

The process involves recognizing patterns defined by the language's grammar and converting them into a format that a parser can utilize. This sets the foundation for the subsequent phases of compilation, such as syntax analysis, semantic analysis, and ultimately code generation. Recognizing and managing tokens efficiently directly impacts how well the compiler will understand and generate the final machine code.

The other options refer to different phases of the compilation process: checking bracket placement pertains to syntax analysis, resolving external references falls under semantic analysis, and producing the final executable file is part of code generation. Each of these plays a distinct role after the lexical analysis phase.