The correct answer is: C. keyword in the C++ language
A keyword is a reserved word in a programming language that has a special meaning to the compiler. In C++, the keyword case is used in the switch statement to specify the value that the expression in the switch statement is compared to.
The other options are incorrect because:
- A function is a block of code that can be called from another part of the program.
- A data type is a way of specifying the type of data that a variable can store.
- A global variable is a variable that is accessible from all parts of the program.
I hope this helps! Let me know if you have any other questions.