What are two important considerations

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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参考解析：

分类：CCNP(642-311)题库

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