The generic type in a template function A. must be T B. can be T C. cannot be T for functions you create, but may be for C++’s built-in functions D. cannot be T

The correct answer is: B. can be T.

A template function is a function that can be used with different types of data. The generic type in a template function is the type that is used to represent the data. The generic type can be any type, including T.

For example, the following is a template function that can be used to add two numbers:

template <typename T>
T add(T a, T b) {
return a + b;
}

This function can be used to add any two numbers, regardless of their type. For example, the following code will add two integers:

int a = 1;
int b = 2;
int c = add(a, b);

The following code will add two floats:

float a = 1.0;
float b = 2.0;
float c = add(a, b);

The following code will add two strings:

string a = "Hello";
string b = "World";
string c = add(a, b);

As you can see, the generic type in a template function can be any type. This makes template functions very powerful and versatile.

Options A, C, and D are incorrect. Option A states that the generic type in a template function must be T. This is not true. The generic type can be any type, including T. Option C states that the generic type in a template function cannot be T for functions you create, but may be for C++’s built-in functions. This is also not true. The generic type can be any type, including T, for both functions you create and C++’s built-in functions. Option D states that the generic type in a template function cannot be T. This is the only option that is incorrect.