Question: What is the primary purpose of a sidelink physical signal in the Evolved Universal Terrestrial Radio Access (E-UTRA) network?
Option 1: To carry information originating from higher layers.
Option 2: To provide synchronization between User Equipment (UE).
Option 3: To facilitate handover procedures between cells.
Option 4: To assist the physical layer in demodulation and synchronization processes.
Explanation: Sidelink physical signals are used by the physical layer to assist in demodulation and synchronization processes, but they do not carry information originating from higher layers. This is evident from the definition of sidelink physical signals, which includes demodulation reference signal and synchronization signal.