Question: What is a key characteristic of the identifier '4FXX' for image instance data files residing under DFGRAPHICS in a SIM-ME interface?
Option 1: It has a fixed length across all image instance data files.
Option 2: Its value must be unique for each image instance data file.
Option 3: The 'XX' range is the same for all SIM cards of a particular operator.
Option 4: It determines the coding scheme used for the image instance data.
Explanation: Ensuring uniqueness of the identifier '4FXX' across different image instance data files is crucial for proper identification and access to these files. This uniqueness allows for efficient management and retrieval of image instances, which is vital in telecom applications where multiple images (e.g., operator logos, graphics) need to be stored and accessed on the SIM card.