Question: Which of the following statements accurately describes how Bearer Services and Teleservices are characterized in a Public Land Mobile Network (PLMN)?
Option 1: Both Bearer Services and Teleservices are characterized solely by high layer attributes.
Option 2: Bearer Services are characterized by both low and high layer attributes, while Teleservices are characterized only by low layer attributes.
Option 3: Bearer Services are characterized only by low layer attributes, while Teleservices are characterized by both low and high layer attributes.
Option 4: Neither Bearer Services nor Teleservices use low layer attributes for characterization.
Explanation: This is correct because, in a PLMN, Bearer Services are defined by their basic transmission capabilities (low layer attributes), whereas Teleservices require both basic transmission characteristics (low layer attributes) and additional functional characteristics (high layer attributes) for their full description.