Both heat_template_version and resources are mandatory if you want to write a HOT template.

The statement is TRUE according to the official HOT specification. OpenStack Heat documentation shows the overall HOT structure and explains that heat_template_version identifies the YAML document as a HOT template of a specific version. This key is fundamental because it tells Heat which template format and feature set to validate.

The same HOT specification states that the resources section contains the declaration of the resources in the template and that this section with at least one resource should be defined in any HOT template , otherwise the template would not really do anything when instantiated. In other words, a valid HOT template intended to deploy a stack needs both the version declaration and a resource definition.

Other sections such as description, parameters, outputs, and conditions are documented as optional. That is why heat_template_version and resources stand out as the core required parts for normal HOT authoring. In Huawei Cloud Stack training contexts based on OpenStack Heat, these are treated as the mandatory structural elements of a HOT template. Therefore, the verified answer is A (TRUE) .

========