Explanation

Option A is correct.

1. Job Creation vs. Execution: The POST /api/2.0/jobs/create endpoint is strictly for registering a job definition. It returns a job_id and stores the configuration, but it does not trigger a run. To start a job, one must use the /jobs/run-now endpoint or configure a trigger.
2. No Uniqueness Constraint: Databricks does not require job names to be unique. Submitting the same payload three times will result in three separate job definitions, each with a unique job_id but the same display name.
3. Default Scheduling: Since no schedule field was provided in the JSON payload, the jobs are created without a trigger. According to Databricks documentation, if the schedule is omitted, the job only runs when manually triggered via the UI or the API.

Why other options are incorrect:

• Option B: The Jobs API does not perform deduplication based on the name field.
• Option C: A schedule (e.g., cron expression) must be explicitly defined in the payload for automatic runs to occur.
• Options D & E: These assume immediate execution. Creating a job is a metadata operation; it does not launch cluster resources or execute code until a 'run' is specifically initiated.