Question: What should be the value of bytes for Elementary Files (EFs) or data items that are unassigned or cleared by the terminal, unless specified otherwise in other 3GPP specifications?
Option 1: '00' - indicating an empty state
Option 2: 'FE' - a unique identifier for deletion
Option 3: 'FF' - a standard value for unassigned or cleared states
Option 4: '01' - signifying a pending update
Explanation: According to specifications, when EFs or data items are in an unassigned state or have been cleared by the terminal, their bytes should be set to 'FF', unless another value is explicitly specified. This ensures consistency and clarity in UICC data management. The value 'FF' is a recognized pattern for indicating an uninitialized or erased state in digital storage contexts.