You are designing a SQL Server Integration Services (SS1S) package that uploads a file to a table named Orders in a SQL Azure database. The company's auditing policies have the following requirements:

OnProgress fires during task execution to report incremental progress and does not indicate that the task has finished.

OnInformation fires only when a task explicitly raises an informational message and is not guaranteed to fire on task completion.

OnPostExecute is raised immediately after a task's or container's Execute method returns, regardless of success or failure. By attaching the log-write logic to this event handler on the file upload task, the OrderLog entry is guaranteed to be written as soon as the task finishes, directly satisfying the auditing policy requirement.

OnComplete is not a standard SSIS event handler; the correct event for capturing the moment after task execution ends is OnPostExecute.