Question: What is the purpose of including non-critical extensions in the ParentIE-WithEM information element?
Option 1: To provide critical extensions for ChildIE1-WithoutEM and ChildIE2-WithoutEM.
Option 2: To connect non-critical extensions with a default extension location in the lower level IEs to the actual extension location in this IE.
Option 3: To define the root encoding of the ParentIE-WithEM information element.
Option 4: To illustrate how the two extension IEs ChildIE1-WithoutEM-vNx0 and ChildIE2-WithoutEM-vNx0 are used.
Explanation: The correct answer is Option 2 because, as explained in the text, non-critical extensions of the Child-IEs have to be included at the level of the Parent-IE. This allows connecting non-critical extensions with a default extension location in the lower level IEs to the actual extension location in this IE.