A constructor initialization list is preceded by

The correct answer is: A constructor initialization list is preceded by one colon.

A constructor initialization list is a list of expressions that are used to initialize the members of a class when an object of that class is created. The syntax for a constructor initialization list is as follows:

“`
class MyClass {
MyClass(int x) : x(x) {}

int x;
};
“`

In this example, the constructor initialization list is preceded by a colon (:). The expression x(x) is used to initialize the member x of the class MyClass.

The following options are incorrect:

• Option B: A constructor initialization list is not preceded by a colon.
• Option C: A constructor initialization list is not preceded by two colons.
• Option D: A constructor initialization list is not preceded by a space.