Explanation:
Box 1: Yes
To allow one segment to communicate with only one other segment, use the New- InformationBarrierPolicy cmdlet with the SegmentsAllowed parameter.
When you want to block segments from communicating with each other, you define two policies:
one for each direction. Each policy blocks communication one way only.
Box 2: No
When you want to block segments from communicating with each other, you define two policies:
one for each direction. Each policy blocks communication one way only.
Box 3: No
Block policies prevent one segment from communicating with another segment.
Allow policies allow one segment to communicate with only certain other segments.
Reference:
https://docs.microsoft.com/en-us/microsoft-365/compliance/information-barriers-policies