Which two issues did the rollout of mobile broadband standards such as HSPA and Evolution Data Only Optimized (EV-DO) make clear about SONET and SDH infrastructure?

Which two issues did the rollout of mobile broadband standards such as HSPA and
Evolution Data Only Optimized (EV-DO) make clear about SONET and SDH infrastructure?
(Choose two.)

A.
They cost effectively scale at the increased traffic volumes.

B.
They do not cost effectively scale at the increased traffic volumes.

C.
They can be deployed in a 4G network rollout.

D.
They provide enough flexibility to increase bandwidth.

E.
They do not provide enough flexibility to increase bandwidth.

Explanation: