A . Automatic execution A constructor (CONSTRUCTOR) is automatically invoked when an instance of a class is created.

B . Importing parameters Constructors can have importing parameters to initialize the object with values.

C . First method called by client Not correct, because constructors are called by the system, not the client explicitly.

D . Returning parameters Constructors cannot return values; they only set up the object.

This behavior is consistent across ABAP Cloud OOP classes, ensuring encapsulated initialization logic.

Verified Study Guide Reference: ABAP Objects Guide -- Class Constructors and Instance Constructors.