Question: In 3GPP specifications, such as those for USIM applications, what does the notation 'XX' (within single quotes) typically represent when referring to coding conventions?
Option 1: A binary value with a specific bit pattern
Option 2: A decimal value used for indexing purposes
Option 3: A text string identifier for data objects
Option 4: A hexadecimal value, where 'X' can be '0' to '9' or 'A' to 'F'
Explanation: In the context of coding conventions within 3GPP specifications, such as those detailing USIM applications, single quotes enclosing 'XX' denote hexadecimal values. This notation distinguishes between number systems in technical documentation. Here, 'X' is a placeholder for any valid hexadecimal digit (0-9, A-F), ensuring clarity for accurate interpretation of data object coding and telecom standards.