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(Single-choice) An IPTV user reports the TV cannot be watched. After enabling OLT debug for multicast /IGMP, the printed information (authorization result) indicates the conclusion below. This can be judged by the results of the query:
Correct Answer: B
In Huawei IPTV access, when the OLT's IGMP audit/authorization debug shows a negative program-rights /authorization result, it indicates that the user lacks permission for the requested multicast program group. This is distinct from port multicast bandwidth alarms (insufficient multicast bandwidth), IGMP snooping state malfunctions, or subscriber traffic shaping/bandwidth checks. Authorization failures map directly to "no permission to watch the program." References: HCIP-Access V2.5 Study Guide - IPTV over PON, IGMP/Multicast Control and CAS/Program Authorization; Huawei OLT Multicast Service Configuration and Maintenance Guide - IGMP Join Authorization Diagnosis.