You have provisioned a Cloud Interconnect connection with a VLAN attachment. You configured Border Gateway Protocol (BGP) between your on-premises router and your Cloud Router. After deploying and testing the connection, you discover that the BGP session is not established between your on-premises router and the Cloud Router. Which two actions should you take to resolve this issue? (Choose two.)

A. From the Google Cloud console, run gcloud compute routers get-status to verify the Address Resolution Protocol (ARP) learned. B. Verify that you have configured the on-premises router's subinterface with a subnet mask of /31. C. Verify that you have configured the on-premises router's eBGP multihop with a minimum hop length of 4. D. Verify that you have configured the on-premises router's BGP security parameters to use MD5 authentication. E. From the Google Cloud console, run gcloud compute interconnects get-diagnostics to verify the Address Resolution Protocol (ARP) learned.