Question: In a USIM's EFKeysPS for the Packet Switched domain, how are the bits of the Ciphering Key (CKPS) arranged in terms of significance within the byte structure?
Option 1: The most significant bit of CKPS is in the 2nd byte, and the least significant bit is in the 17th byte.
Option 2: The most significant bit of CKPS is in the 17th byte, and the least significant bit is in the 2nd byte.
Option 3: Both the most and least significant bits of CKPS are located within the same byte (the 2nd byte).
Option 4: The arrangement of CKPS bits starts from the middle bytes (9th and 10th bytes) for most and least significant bits respectively.
Explanation: According to specifications, the Ciphering Key (CKPS) has its most significant bit in the 2nd byte and its least significant bit in the 17th byte, highlighting the detailed structure of security keys in telecom networks for secure packet switched communications.