Question: In a SIM-ME interface, when the EIA/TIA-553 DF is provisioned on the SIM for TIA/EIA-41 based radio access systems, how should unused bytes in a series (e.g., Partner SID List) be set by default?
Option 1: Set to '00' to indicate an empty field
Option 2: Left unchanged from the manufacturing default
Option 3: Set to 'FF' as per the specified default rule
Option 4: Allocated dynamically based on available memory
Explanation: According to specifications, all unused bytes in a series of values (like lists of SID) should be set by default to 'FF', ensuring consistency and clarity in data representation.