spectrum efficiency and MIMO rely on a system called beamforming $/$ what does this term refer to $?$ Select all that apply which of the following is correct? a$.$ a connectivity system that identifies the closest base station for each user b$.$ a traffic signaling system that break down the data into smaller packets for transport c$.$ a connectivity system that caps the number of users utilizing the network d$.$ a traffic signaling system that identifies the root of least interference to deliver data