question: What is the advantage of beam focusing in near-field wireless communications? option 1: Beam focusing provides a new degree of freedom to shape interference in the angle domain. option 2: Beam focusing provides a new degree of freedom to shape interference in the distance domain. option 3: Beam focusing enables capacity-approaching near-field MIMO communications. option 4: Beam focusing can mitigate co-channel interference in conventional far-field communications. option 5: Beam focusing allows for multiple coexisting orthogonal links at the same angles. 