Option A is incorrect. While 'TRY_COMPLETE generally returns 'NULL' for operations that cannot be performed, the documentation explicitly states that if a model powering a Cortex function (including 'TRY COMPLETE') is not allowed by the allowlist or RBAC, an 'error message contains information about how to modify the allowlist'. This suggests an actual error is raised rather than 'NULL' being returned for access control violations, unlike internal processing errors. Option B is correct. 'TRY COMPLETE' is designed to return 'NULL' instead of raising an error when an operation cannot be performed, which includes scenarios where the LLM encounters internal errors during response generation. Option C is correct. The 'CORTEX MODELS ALLOWLIST controls which models can be used when referenced by their plain names (e.g., 'mistral-large2'). However, model-level RBAC, granted through application roles on fully-qualified model objects (e.g., 'SNOWFLAKE.MODELS."LLAMA3.1-70B"'), provides an independent access path that bypasses the plain-name allowlist check for those specific model objects. Option D is correct. 'TRY_COMPLETE does not incur costs for error handling; if the function returns 'NULL' , no cost is incurred for that specific call. Option E is incorrect. 'TRY COMPLETES, like 'COMPLETE' , does not retain state between calls. To provide a stateful conversational experience, all previous user prompts and model responses must be explicitly passed in the array argument.