Which three factors make optical a critical component of service provider networking? (Choose three.)
A. Optical hardware has a long 10-15 year life span.
B. Optical local area networks are gaining in popularity.
C. Packet networking and optical hardware are converging.
D. Optical hardware churns frequently and needs frequent replacement.
E. Optical networking is the foundation of all WANs.
F. Many models of optical hardware have reached end-of-life.
