Which type of combat order precisely and concisely explains the mission the commanders intent?

An OPORD which is the abbreviation for operations order is the kind of combat instruction which is exactly and briefly explains the mission of the commander’s intent and idea of how to accomplish a mission. It is a organized to establish an act into five easily understood paragraphs: Situation, Mission, Execution, Sustainment and Command and Control.

Its either b or c   i'm leaning towards b though i've heard of them during that time period