How do you initialize a static variable 'v' of class Something in C++?

To initialize a static variable 'v' of a class in C++, the correct approach is to specify the class name followed by the scope resolution operator ::, and then assign a value to the variable. This allows the static variable to be associated with the class itself rather than with instances of the class.

In this case, declaring int Something::v = 1; does exactly this: it tells the compiler that the static variable 'v' belongs to the class Something and initializes it to the value of 1. This kind of initialization outside the class definition is necessary because static members must be defined outside of their class declaration unless they are initialized in the class itself at the point of declaration (which requires certain conditions to be met).

The other options do not correctly follow the syntax or concepts required for initializing a static class variable in C++. For instance, using static int Something.v=1; is incorrect because it uses a dot syntax that doesn't apply to class static member initialization in C++. Similarly, Something::v=1; lacks the type declaration needed for defining the variable, and int v=1; attempts to define a variable v but not as a member of the class `Something