What is one possible way to expand the system capacity of an NS-series system?

A.
Change the redundancy level from DMR to TMR.

B.
Add a pair of VIOs to an NS1200 system.

C.
Add more CPUs to an NS16000 system.

D.
Replace the single-mode fiber PICs in slot 4 to 9 of the p-switches with multi-mode fiber
PICs.