Question: In a specific band combination for E-UTRA, what does a value of '1' in the first bit of the `commSupportedBandsPerBC-r12` field indicate regarding User Equipment (UE) capabilities?
Option 1: The UE supports simultaneous reception and transmission of EUTRA and sidelink on the first indicated band.
Option 2: The UE only supports sidelink communication on the first indicated band, without EUTRA.
Option 3: The UE does not support sidelink on the first indicated band but supports EUTRA.
Option 4: The UE supports only EUTRA transmission on the first indicated band, with no sidelink capability.
Explanation: A value of '1' in the first bit of `commSupportedBandsPerBC-r12` indicates the UE supports simultaneous reception (and potentially transmission, if specified) of EUTRA and sidelink on the first listed band, enabling both types of communication simultaneously.