Question: In a Charging Data Record (CDR), what does the 'Record Type' field primarily indicate about the record?
Option 1: The International Mobile Subscriber Identity (IMSI) of the served party
Option 2: The Diameter Identity of the SCEF serving the PDN connection
Option 3: The type of record, distinguishing between CPCN-SCE-CDR and CPCN-SNN-CDR
Option 4: The structure definition reference for IMSI as per specifications
Explanation: The 'Record Type' field in a Charging Data Record (CDR) identifies the specific type of record, such as CPCN-SCE-CDR for Service Central and Charging (SCEF) related records or CPCN-SNN-CDR for Serving and Network Node (SNN) related records, crucial for accurate charging management and data analysis.