The method that is automatically called when you pass an object as an argument to the print function is option b. obj.
Println automatically is the tool that tends to invokes the toString() function, but any object may manually invoke the method. On an object, such as this one named object, the method may be invoked. toString() or a numeric number, such as this - Integer, can be used to pass a value to the method.
Therefore based on the above, the String representation of the object is returned by the toString() function. Java compiler internally calls the toString() function on any object when you print it. The toString() method of the Object class is called by the println() method when printing an object.
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