<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def ListJobs(self, token=None):
 """Returns a list of all currently running cron jobs."""

    job_root = aff4.FACTORY.Open(self.CRON_JOBS_PATH, token=token)
    return [urn.Basename() for urn in job_root.ListChildren()]