question: What benefits can be realized by strategically positioning RISs in vehicular networks? option 1: Improved V2X connections in the presence of line-of-sight (LoS) propagation option 2: Enhanced spectral and energy efficiency option 3: Increased capacity gains in vehicle-to-infrastructure (V2I) communications option 4: Extended transmission range in the absence of LoS propagation option 5: All of the above 