Question: What do the symbols '0' to '9' and 'A' to 'F' represent in the context of the Subscriber Identity Module - Mobile Equipment (SIM-ME) interface?
Option 1: The sixteen hexadecimal digits
Option 2: Supply voltage levels for SIM operation
Option 3: Programming voltage ranges for secure data writing
Option 4: Physical dimensions of ID-1 and Plug-in SIM types
Explanation: In telecommunications, specifically within the SIM-ME interface specifications, '0' to '9' and 'A' to 'F' represent hexadecimal notation for encoding binary data in a human-readable format, used for data, commands, or identifiers in SIM-ME interactions.