CLR stands for
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Common Language Runtime
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Common Language Routine
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Class Library Routine
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None
CLR stands for Common Language Runtime, which is the execution engine of the .NET Framework. It manages memory execution, thread execution, code safety verification, compilation, and other system services, making it a fundamental component of .NET applications.
Common Language Runtime is correct — CLR is the virtual machine component of Microsoft's .NET Framework that manages the execution of .NET programs: it handles JIT compilation of IL (Intermediate Language) code to native machine code, memory management and garbage collection, exception handling, type safety, and security. 'Common Language Routine' and 'Class Library Routine' are not real .NET terms — they're plausible-sounding but fabricated expansions of the acronym, and 'None' is simply wrong since CLR is a well-established, correctly-expanded term in .NET documentation.