A corresponding COA statement and sketch should be created for each what?

The correct choice focuses on the phase where a Course of Action (COA) has been preliminarily selected for analysis. This is a critical step because a corresponding COA statement and sketch provide essential details regarding the COA's concept, capabilities, and the intended outcomes. The purpose of creating these documents at this stage is to ensure clarity and facilitate a thorough evaluation of the COA's feasibility, suitability, and acceptability before any decisions are made regarding execution.

In the earlier phases of the process, like during the initial selection of COAs, these detailed statements and sketches may not be required since they are primarily used to support deeper analysis rather than initial considerations. Likewise, if a COA has been prepared for execution, the focus shifts toward implementation rather than analysis. Finally, if a COA has not been evaluated, it would not warrant a corresponding statement and sketch since there is no analysis being performed at that point. Thus, preparing the documentation specifically for COAs selected for analysis aligns with the need for a comprehensive and well-structured evaluation process.