Compiler switches are command line arguments that modify the compiler's behavior during compilation is correct.

These switches are options passed to the compiler when you invoke it and they change how the compiler processes source code. They control things such as optimization level, warning and error reporting, generation of debug symbols, include and library search paths, language standard or dialect selection, and the name or format of output files.

Cloud Build is incorrect because that name refers to a build or CI service and not to a compiler command line argument. A build service may call compilers, but it is not itself a compiler switch.

Compiler switches are used mainly to provide extra runtime debugging output while the program executes is incorrect because switches operate at compile time. They can embed debug information and affect optimizations, but they do not directly cause the program to produce extra runtime logging while it runs.

Compiler switches determine which programming language a project is written in is incorrect because the programming language is determined by the source code and the compiler you choose. Switches can select a standard or dialect within a language, but they do not change the language the project is written in.

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