Which of the following is a source of loss in coaxial feed line?

Signal loss in a coaxial feed line can occur for several reasons. Water intrusion changes the dielectric properties of the cable, causing severe signal absorption and altering the cable's impedance, which leads to heavy losses. Additionally, high SWR (Standing Wave Ratio) causes power to be reflected back and forth along the line, increasing normal attenuation losses. Finally, every connector or adapter spliced into the line introduces a slight impedance bump and physical junction, adding a small amount of insertion loss. Because all of these factors degrade the signal, every listed choice represents a legitimate source of power loss in a coaxial system.