Which two statements best describe the Fresnel zone related to an outdoor RF point-to-point link? (Choose two.)
A. blocks no more than 20 percent
B. blocks no more than 40 percent
C. blocks no more than 60 percent
D. comprises a single zone to keep clear
E. comprises multiple zones of which the first inside zone is the most important to keep clear
F. comprises multiple zones of which the outside zone is the most important to keep clear
