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