When is it most important to implement multiple synonymous area addresses on an IS-IS network?

When is it most important to implement multiple synonymous area addresses on an IS-IS network?
A . when integrating an IS-IS Layer 2 router with another routing protocol
B . when merging or splitting areas in the IS-IS domain
C . when an IS-IS router is merging routing information
D . when splitting areas in the IS-IS domain

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Answer: B