Given the metric below: Using iSCSI storage reports across three datacenters, which of the following recorded metrics indicates an anomaly in the performance?

Disk latency is a direct and critical metric for storage performance, indicating the time required for read/write operations on the storage device.

CPU utilization on the iSCSI target server or the initiator server can directly impact iSCSI performance by bottlenecking I/O processing.

WAN latency is a crucial metric for iSCSI performance, especially when storage is accessed across datacenters, as it directly impacts response times for block-level storage operations over the network.

RAM utilization is primarily a metric for server or host performance, indicating how much memory a system is consuming. While the host's RAM can indirectly affect application performance which then impacts its interaction with iSCSI, an anomaly in RAM utilization does not directly or primarily point to an issue with the iSCSI storage array itself or the network path to it, but rather with the host operating system or applications.