Final answer:
The correct completion for the sentence given the context would be 'The latest deployment has been unsuccessful.' This term relates to software or application deployment, where an X icon often indicates a failure or problem.
Step-by-step explanation:
The question refers to a term that is commonly used in the context of software or application deployment. In this scenario, when an X icon is mentioned, it likely symbolizes an error or problem. Based on the context provided, the most suitable option among the choices would be (d) Unsuccessful. So, the complete sentence would be: The latest deployment has been unsuccessful.
An unsuccessful deployment can occur due to various reasons such as code errors, infrastructure problems, configuration issues, or failing automated tests. It is important to investigate the cause and address any issues to ensure a successful deployment in the future.