What are three questions consultant should ask that would directly impact the technical factors of their migration strategy?

Unified communication is dependents on a large number legacy system that works in virtual product silos. Business capacities are duplicated across multiple system, requiring manual efforts to complete orders and service request.

The complex system landscape makes it difficult to support growing business models so UC is planning to upgrade the communication cloud while also considering migration for their existing subscribers to communication cloud.

What are three questions consultant should ask that would directly impact the technical factors of their migration strategy?
A . What data and from which system will be migrated
B . Who will be the main point of contact for migration
C . What tools and databases will be used to perform the migration
D . What will be the overall cost for migration?
E . What is the quality, structure and frequency of the data migration?

Answer: A, C, E