A developer has successfully created a Cortex Search Service named transcript _ search service within cortex_search_db. services based on customer support transcripts. They now need to query this service to find support tickets related to 'internet issues' specifically from the 'North America' region, and they only want the single most relevant result. Which of the following SQL commands correctly performs this query?

Correct Answer: A
Option A is the correct syntax for querying a Cortex Search Service using the SEARCH PREVIEW function, as demonstrated in the sources. It correctly specifies the service name, query, columns to retrieve, filter condition using the operator, and the limit, all within a JSON @eq string. Options B, C, D, and E use incorrect function names, parameter formats, or JSON structures for the SEARCH PREVIEW function as defined in the provided documentation.