In TSO (Time Sharing Option) or ISPF (Interactive System Productivity Facility), a job can send a status message to the TSO user at the completion of the job using the NOTIFY command.
By specifying the NOTIFY parameter in the job's JCL (Job Control Language) or by using the NOTIFY command within a program, the TSO user will receive a message indicating the completion status of the job once it finishes executing. This allows the user to be notified and stay informed about the job's completion.
Option A (STATUS), Option C (ENDMSG), and Option D (USER) are not valid options for sending a status message to the TSO user at the completion of a job in TSO or ISPF.