Question: In E-UTRA, what is implied by the presence of the 'addSRS-r16' field in a User Equipment's (UE) radio access capabilities?
Option 1: The UE supports enhanced Inter-Cell Interference Coordination (eICIC) in FDD mode.
Option 2: The UE can transmit Sounding Reference Signals (SRS) only in dedicated UL subframes in TDD mode.
Option 3: The UE is capable of Carrier Aggregation (CA) with up to 5 Component Carriers (CCs).
Option 4: The UE supports additional SRS symbol(s) within normal UL subframes in Time Division Duplexing (TDD) mode.
Explanation: The presence of 'addSRS-r16' signifies the UE's capability to support extra Sounding Reference Signal symbols within regular uplink (UL) subframes specifically in Time Division Duplexing (TDD) mode, enhancing uplink channel sounding and scheduling in TDD configurations.