Refer to the exhibit.Cisco Unified Border Element is attempting to establish a call with Subscriber 1, but the call fails. Cisco Unified Border Element then retries the same call withSubscriber 2, and the call proceeds normally. Which action resolves the issue?

A. Verify that the Run On All Active Unified CM Nodes checkbox is enabled. Most Voted B. Verify that the correct calling search space is selected for the Inbound Calls section. C. Verify that the Significant Digits field for Inbound Calls is set to All. D. Verify that the PSTN Access checkbox is enabled.