Which two are examples of open-ended questions? (Choose two.)

A.
What switch models do you currently use in your network?

B.
What are the main reasons why customers prefer ordering services from you?

C.
What is the planned ROI for this new implementation?

D.
What do you think about the future of the Data Center market?

E.
What are your working hours?

F.
Does your existing infrastructure maintenance become more problematic each year?