Question: In E-UTRA, what is the primary purpose of the `ue-TxAntennaSelection-SRS-2T4R-3Pairs-r15` field in relation to a UE's transmission capabilities?
Option 1: To determine the UE's support for transmitting SRS on multiple bands simultaneously without antenna pair selection.
Option 2: To indicate whether the UE can select one out of three antenna pairs for simultaneous SRS transmission on a specific band in a band combination.
Option 3: To specify the number of SRS ports a UE supports for MIMO operations in a 2T4R configuration.
Option 4: To enable or disable SRS transmission based on UE's power consumption constraints.
Explanation: This option correctly reflects the purpose of the `ue-TxAntennaSelection-SRS-2T4R-3Pairs-r15` field, which is to signify the UE's capability to choose one antenna pair out of three for simultaneous transmission of Sounding Reference Signals (SRS) on a particular band within a band combination. This feature enhances flexibility in managing radio resources and optimizing network performance.