The purpose of the Common Type System (CTS) of Common Language Runtime (CLR) is to provide a language-neutral platform for the following:

[A] Support multiple languages because it contains a type system that is common across all the languages of only .NET Framework Application development environment.

[B] CTS provides a base set of data types, where the size of integer and long variables is same across all .NET-compliant programming languages.

[C] CTS provides the data type system where int32 to represent a 4 byte integer value.

[D] All of the above