Which of these is one of the two basic rules of deterministic (or hierarchical) modelling)?

Question

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The two basic rules of deterministic (or hierarchical) modelling are:
1) The boxes in level 2 are, if possible, a sub-division of the performance criterion
2) All boxes on one level are dependent on at least one box on the level above. Choice A is incorrect because it suggests a bidirectional link, which is not necessary. Choice C is also incorrect because the boxes on the same level may or may not be directly related to each other. Choice D is incorrect because there is a correct answer.

Which of These Is One of the Two Basic Rules