E9F08 — Amateur Extra Class

E9F08 : Which of the following is a significant difference between foam dielectric coaxial cable and solid dielectric coaxial cable, assuming all other parameters are the same?
A Foam dielectric coaxial cable has lower safe maximum operating voltage
B Foam dielectric coaxial cable has lower loss per unit of length
C Foam dielectric coaxial cable has higher velocity factor
D All these choices are correct
Correct Answer: All these choices are correct