What is one of the configuration errors within an AS that can stop a Cisco IOS-XR router from announcing certain prefixes to its EBGP peers?

What is one of the configuration errors within an AS that can stop a Cisco IOS-XR router from announcing certain prefixes to its EBGP peers?
A . Some prefixes were mistagged with the no-export BGP community
B . Some prefixes were set with an MED of 0
C . The outbound BGP route policy only has set actions defined without any pass actions defined
D . The inbound BGP route policy only has set actions defined without any pass actions defined

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Answer: A