Which of the following statements is true about C++ constructors?

The correct choice highlights a fundamental aspect of object-oriented programming in C++. In C++, it is perfectly valid for a class to have multiple constructors, a feature known as constructor overloading. Each of these constructors can differ from one another in the number or type of parameters they accept. This flexibility allows for initializing objects in various ways depending on the context in which they are created.

For example, consider a class named Circle. You could have one constructor that takes no parameters (which might set a default radius), another that takes a single parameter to specify the radius, and possibly even a third that takes two parameters to specify both the radius and the color of the circle. Each of these constructors facilitates the creation of Circle objects in a way that best suits the needs of the programmer at that moment.

The other choices present aspects that are not accurate according to C++ rules. Constructors must share the same name as the class and cannot have a return type, including void. They are also invoked automatically when an object is created, not manually by the user. Understanding these key points helps to solidify the concept of constructors and their critical role in the instantiation of class objects in C++.