Which requirement must be fulfilled for Kinesis Firehose and HEC?

The correct option is one that highlights the requirement of needing a support ticket for enabling the integration between Kinesis Firehose and the HTTP Event Collector (HEC) in Splunk Cloud. This is crucial because it points to the fact that such configurations often involve specific settings and protocols that ensure security and effectiveness in data ingestion. Enabling HEC for Kinesis Firehose is not something that can be done directly by users for several reasons:

1. Security Considerations: The integration might involve sensitive configurations that require validation and oversight by Splunk support to ensure that all security measures are in place.

2. Resource Management: Such processes often necessitate evaluation of the infrastructure’s capability and possible implications on performance, making it imperative that support is involved.

3. Customization Needs: Different use cases may require specific tailoring of settings, which could be unique to customer environments; having professional support manage this can ensure an optimal and safe configuration.

The other options do not reflect the reality of the process related to Kinesis Firehose and HEC. For instance, enabling HEC by customers themselves or it being automatically enabled does not align with the best practices in a controlled environment like Splunk Cloud. The consideration of security is critical in environments handling potentially