how to define constructor of a subclass inheriting an inner class?

I am learning inner and outer classes in Java. I know what inner and outer classes are and why they are used. I came across the following question on this topic and could not find an answer.

Suppose the following code is given:

class outer{
    class inner{

    }
}

class SubClass extends outer.inner{
}

Question: How should the minimal subclass constructor be defined? and why?

Option 1-
Subclass () {
    //reason: bacause the default constructor must always be provided
}
Option 2-
Subclass (Outer outer) {
    //reason : because creating an instance of **Subclass** requires an instance 
    //of outer, which the **Subclass** instance will be bound to
}

Option 3-
Subclass (Outer outer) {
    outer.super();
    //reason : because creating an instance of **Subclass** requires an explicit 
    //call to the **Outer's** constructor, in order to have an enclosing instance 
    //of **Outer** in scope.
}
Option 4- 
Subclass (Outer.inner inner) {
    //reason : bacause an instance of **inner** is necessary so that there is a 
    //source to copy the derived properties from
}

PS. This is a multiple choice question. Only 1 answer is expected

i am new to java and don't know much about these advanced topics

Thanks