When dealing with customers on the phone that are not very comfortable with technology, which of the following techniques would be MOST helpful to ensure that effective communication is taking place?（）

A、Frequently paraphrase what the caller is saying.

B、Repeat what is being said multiple times so that the customer can understand exactly what to do.

C、Speak very slowly when replying to the customer.

D、Tell the customer to send an email stating exactly what the problem is so that the communication between the two parties is clear.