问题：

[单选] When an Enterprise Campus network designer is addressing the merger of two companies with different IGPs， which of the following is considering a super routing design？（）

A .  Eliminate the management and support for redistribution by choosing and cutting over to asingle IGP at the time of merger
B .  Maintain distinct pockets across a moving boundary of routing protocols， redistributing betweenthem
C .  Manipulate the administrative distance of the different IGPs to be equal throughout the network
D .  Leave the IGPs independent without redistribution wherever communication between companyentities is not required