Question: What is the primary purpose of the EFDCK file, as mandated by 3GPP specifications, in relation to a USIM application when service n° 36 is available?
Option 1: To store authentication keys for secure voice calls
Option 2: To provide storage for OTA (Over-The-Air) de-personalization control keys
Option 3: To manage data encryption for SMS transmissions
Option 4: To hold configuration settings for mobile equipment's Wi-Fi connectivity
Explanation: The EFDCK file is specifically designated for storing de-personalization control keys associated with the OTA de-personalization cycle, crucial for managing and securing the personalization process of Mobile Equipment (ME).