Which of the following statements about the high reliability of POL networks is incorrect?

Which of the following statements about the high reliability of POL networks is incorrect?
A . Type B phase
B . Type C has higher protection cost
C . Type B and Type C protection networking is feasible
D . P622 can provide dual-link uplink protection
E . Type B and Type C protection: When the main fiber fails, it can automatically switch to another fiber.

Answer: A