Which namespace is commonly used in C++ programming?

The correct answer is the "standard (std)" namespace, which is commonly used in C++ programming. This namespace is integral to the language as it contains all the standard library functions and objects, including classes and functions that facilitate input and output, manipulation of data types, and other essential programming utilities. When you include the standard library headers in your C++ program, you typically access these functions and classes using the "std" prefix unless you specify otherwise (for instance, by using a 'using namespace std;' directive).

Utilizing the standard namespace allows programmers to avoid name conflicts and to clearly indicate which functions or classes are part of the standard C++ library. This organization, provided by the "std" namespace, helps maintain clarity and order in larger codebases, where the likelihood of naming collisions between user-defined and library-defined components is higher.

The other options do not serve as commonly used namespaces in C++. The "global" namespace refers to the default namespace where functions or variables are defined when no specific namespace is declared, and while it's an important concept, it is not as frequently referenced explicitly in C++ programming. The "system" namespace is not standard and is not typically recognized in standard C++. Lastly, "namespace" on its