Each generic type in a template function definition is preceded by the keyword _________

The correct answer is: A. template

A template function is a function that can be used with different types of data. The type of data that a template function can be used with is called a generic type. Each generic type in a template function definition is preceded by the keyword template.

For example, the following is a template function that can be used with any type of data:

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

This function can be used to add two integers, two floats, or two strings. For example, the following code calls the add function to add two integers:

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

The add function can also be used to add two floats:

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

And the add function can also be used to add two strings:

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

The template keyword is used to tell the compiler that the function can be used with different types of data. The T in the template <typename T> declaration is a placeholder for the type of data that the function will be used with. When the compiler sees the template keyword, it will generate a different version of the function for each type of data that it can be used with.

The add function is a simple example of a template function. However, template functions can be very complex, and they can be used to create very powerful and flexible code.