Correct Answer - Option 1 : mscorlib.dll and System.dll
mscorlib.dll and System.dll are assemblies that include the core set of NET common exception types, data types, and numerous other fundamental building blocks. It stands for Microsoft's Common Object Runtime Library and it is the primary assembly for the Framework Common Library.
Hence the correct answer is mscorlib.dll and System.dll.
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System.data.dll can arise for a few different different reasons. For instance, a faulty application, system.data.dll has been deleted or misplaced, corrupted by malicious software present on your PC, or a damaged Windows registry.
- System Web.dll is an old library responsible for the whole http-protocol working, requests sending, and creation.
- System.configuration.dll are categorized as Win32 DLL (Dynamic-link library) files. As a System. Configuration.dll file was created for use in Microsoft.