Question: What is the primary purpose of DP criteria in the context of CAMEL (Customised Applications for Mobile network Enhanced Logic) Phase 4?
Option 1: To determine the CAMEL phase requested by the gsmSCF for a service.
Option 2: To decide whether to apply ODB or perform normal call handling when CAMEL is not supported.
Option 3: To indicate whether the gsmSSF should request the gsmSCF for instructions.
Option 4: To specify the subscriber's preferred handling in case of a lower CAMEL phase support.
Explanation: The correct answer is Option 3 because DP criteria are specifically defined as indicators for whether the gsmSSF should request instructions from the gsmSCF, relating to the decision-making process within the network regarding service handling and instruction retrieval.