What is a potential significant issue for a prospect migrating to AWS that network monitoring could address?

Migrating to AWS can present various challenges, particularly related to the costs that can arise from how data is transferred across different availability zones. Option B highlights a significant issue: expensive AWS bills caused by cross-availability-zone traffic. When resources and data are located in different availability zones within AWS, there are additional costs associated with transferring data between them. Effective network monitoring plays a crucial role in helping organizations identify and manage data transfer patterns, as well as understanding their implications on the overall AWS bill.

By closely monitoring network traffic, organizations can optimize their architecture to minimize unnecessary cross-zone data transfers. This could involve strategically placing resources to reduce costs or analyzing usage patterns to ensure efficient data flow. Consequently, this focus on network monitoring not only assists in managing costs but also helps in achieving a more efficient and cost-effective cloud infrastructure.

The other options, while valid topics of concern during a migration, do not directly address how network monitoring specifically contributes to managing and mitigating potentially significant financial impacts associated with data transfer in a cloud environment.