Question: What is a condition that must be met for a Mobile Station (MS) to attempt call re-establishment after a radio link failure?
Option 1: The MS must have at least two active MM connections.
Option 2: The MS must be in the MM IDLE state.
Option 3: At least one MM connection is active and a lower layer failure has occurred.
Option 4: The MS must have performed a location update in the current location area.
Explanation: According to the call re-establishment procedure, the mobile station can attempt to resume a connection in progress after a radio link failure if at least one MM connection is active and a lower layer failure has occurred. This ensures that the MS can recover from a temporary loss of connectivity and maintain an ongoing call.