Final answer:
The disciplinary action PAR form is accessible through the Soldier Self-Service Portal on IPPS-A.
Step-by-step explanation:
The disciplinary action PAR form on the Integrated Personnel and Pay System - Army (IPPS-A) can be accessed through the Soldier Self-Service Portal. This portal allows soldiers to manage their personal information and actions related to their service. Hence, the correct answer to the question is C) Soldier Self-Service Portal.