What are two important considerations when using 2- or 4-channel 15216 OADMs?（） (Choose two.)A、All "Add" channels require uniform power levels.B、The flexibility of wavelengths per OADM is limited.C、It is easier to balance "Pass-Through" and "Add" channels.D、There is lower pass-through loss using multi-channel OADMs.E、You can extract a single channel without dropping other channels.
What are two important considerations when using 2- or 4-channel 15216 OADMs?（） (Choose two.)
- A、All "Add" channels require uniform power levels.
- B、The flexibility of wavelengths per OADM is limited.
- C、It is easier to balance "Pass-Through" and "Add" channels.
- D、There is lower pass-through loss using multi-channel OADMs.
- E、You can extract a single channel without dropping other channels.
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