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

A certain network has 2,250 equivalent network elements of SDH series, 1,000 equivalent network elements of WDM series, and 1,000 equivalent network elements of router series. The customer purchased value-added functions 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 . Since there are SDH, OTN and router series network elements, it is necessary to install the SDH network element manager, OTN network element manager and router network element manager subsystems
B. The maximum management capacity of the SDH network element manager subsystem is 2500 equivalent network elements, so one SDH network element manager instance needs to be deployed; the maximum management capacity of the router network element manager subsystem is 5000 equivalent network elements, Therefore, a router NE manager instance needs to be deployed
C. Due to the purchase of SDH end-to-end and WDM end-to-end value-added features, it is necessary to install SDH network management subsystem and OTN network management subsystem; due to the purchase of Corba northbound interface, it is necessary to install Corba northbound subsystem
D. If the OTN series network elements are OSN 6800+OSN 8800T32 (without ASON, the ratio of the two numbers is 1:1), among which OSN 6800 is used as the master subrack, and OSN 8800 is used as the slave subrack. And each master subrack carries only one slave subrack. The actual number of OSN 8800 physical network elements is 125

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Answer: B