Which of the following soft skills is essential for a solution architect to have?

The correct answer indicates the importance of a range of essential soft skills that a solution architect should have. Collaboration is crucial because solution architects often work in diverse teams that require different stakeholders' inputs. This skill fosters a cooperative environment where various perspectives are considered to create a comprehensive solution.

Coordination is also vital, as solution architects must ensure that multiple project components align and progress appropriately. They often manage interactions between team members, stakeholders, and clients, facilitating smooth workflows and avoiding potential conflicts.

Communication stands out as a fundamental skill because solution architects must convey complex technical concepts in a way that is understandable to non-technical stakeholders. This includes writing documentation, presenting ideas, and articulating project requirements clearly and effectively.

Thus, recognizing the importance of all these skills reinforces the collaborative, organized, and communicative role that solution architects play in successful project delivery, making option "D. All of the above" the most comprehensive and accurate choice.