Question: Which of the following GMM messages are not ciphered when ciphering is applied on a GMM context?
Option 1: ATTACH ACCEPT, AUTHENTICATION AND CIPHERING REQUEST
Option 2: ATTACH REQUEST, AUTHENTICATION AND CIPHERING REQUEST, IDENTITY REQUEST
Option 3: ROUTING AREA UPDATE REQUEST, DETACH REQUEST
Option 4: SERVICE REQUEST, AUTHENTICATION RESPONSE
Explanation: According to the specifications, when ciphering is applied on a GMM context, certain messages are exempt from being ciphered. These include ATTACH REQUEST, AUTHENTICATION AND CIPHERING REQUEST, and IDENTITY REQUEST among others. This ensures that critical initial communication steps remain unencrypted for proper authentication and setup before encrypted data transfer begins.