This qstn needs clarification: "Which property declaration is appropriate when defining a parent-child relationship?"

The following is a multiple-choice question:

Which property declaration is appropriate when defining a parent-child relationship?

Both of the following are provided as possible answers:

@property(nonatomic, weak); @property(nonatomic, strong);

My understanding is that strong is specified for the property of the parent that points to the child, and weak is used for the child's property that points to its parent.

Maybe strong is used, like, always, but at this point in the course that's not been taught. As someone with no Obj C experience prior to this course, this question seems unclear.

Edit: The correct answer was "@property(nonatomic, strong);", so I guess the question really should be phrased, "Which property declaration is appropriate for specifying a child of this object?", or "Which property declaration is appropriate to define this object as the parent of the declared property?", or something.

I guess my real question is, how do I report this?