The ACMP Standard states that a strong communication plan is built onthree critical inputs:
* Change impact assessment(defines what will change and who is impacted).
* Organizational change readiness assessment(measures preparedness to receive messages).
* Stakeholder analysis(identifies audiences and influencers).Customer input (A, D) and operational strategies (C) may provide context, but they are not the essential core inputs. Option B matches ACMP guidance for communication planning.(Reference: ACMP Standard, Process Group 3 - Communication Plan; Inputs: Impact assessment, readiness assessment, and stakeholder analysis.)