Regarding this network management deployment plan, which of the following is wrong?

A network has SDH series of 2255 equivalent NEs, the WDM series of 1000 equivalent NEs, router series of 1000 equivalent NEs. Customers purchased value-added features such as SDH end-to-end, WDM end-to-end, and Corba northbound.

Regarding this network management deployment plan, which of the following is wrong?
A . Because there are SDH, OTN, and router series network elements, you need to install the SDH network element manager, OTN network element manager, and router network element manager subsystem.
B . The maximum management ability of SDH NE manager subsystem is 2500 equivalent NEs, so it is necessary to deploy SDH network element manager instance; the maximum router management ability of NE manager subsystem is 5000 equivalent NEs, so it is necessary to deploy 1 router NE management instance.
C . Due to purchase the SDH end-to-end, WDM end-to-end value-added features, so you need to install SDH network management subsystem, OTN network management subsystem; due to the purchase of Corba northbound interface, so you need to install Corba northbound subsystem
D . If the OTN series network elements are OSN 6800 + OSN 8800T32 (without ASON, the ratio between the two is 1:1), where OSN 6800 is used as the master subrack and OSN 8800 is used as the slave subrack. And each master subrack only carries one slave subrack. The actual OSN 8800 physical network element number is 125.

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Answer: B