Which set of commands on the router fix this problem?

Refer to the exhibit. Network administrator is implementing SIP trunk digest authentication. After making outbound tests, the calls are failing with 503 service unavailable error from the router after being challenged. Which set of commands on the router fix this problem?


A. sip-ua
Registrar ipv4:172.16.100.90 expires 3600
Authentication cisco realm MD5 LabCluster1
B. sip-ua
Authentication username cisco password 7 cisco realm LabCluster1
C. Voice service voip
Sip
Authenticate digest MD5 LabCluster1
D. Voice service voip
Sip
Authenticate digest LabCluster1 MD5

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