Which of the following has the potential for unexpectedly impacting storage array performance?

WWN-based hard zoning is a security and access control mechanism in Fibre Channel fabrics that logically isolates devices and does not inherently impact the performance of the storage array itself.

Multipathing is a technology that improves storage performance and availability by providing multiple data paths between a server and its storage, distributing I/O and enabling failover, thus enhancing performance rather than degrading it.

Host-based inline de-duplication, while consuming host resources, aims to improve storage efficiency and can enhance overall performance by reducing the amount of data written to and read from the storage array, not unexpectedly degrade it.

Automated storage tiering dynamically moves data blocks between different storage media, such as SSD, SAS, and SATA, based on usage patterns. If not optimally configured, or if data access patterns change unpredictably, critical or 'hot' data might be inadvertently moved to slower tiers, leading to unexpected performance degradation.