Develop a communication strategy related to an upcoming EPIC's software version update of the Electronic Health Record system. Determine which of the three types of approaches: top down, bottom up, and integrative is the best and why. Also, identify which groups of employees will be affected by the change and answer the below questions about the change. 

• How will each group be affected by the change? 

• Who are the key opinion leaders of each group? 

• What are the preferred channels of each group? 

• What does each group know about the change? 

• What are the most likely concerns of each group?