Which of the Following Is a Tip to Be Adopted

Which of the following is a tip to be adopted for creating a positive telephone image?

A) End the call abruptly since it is essential to respect the customer's time.
B) Use a canned or mechanical presentation to gain the customer's attention.
C) Adopt a flippant approach when the customer gets unreasonable.
D) Continually evaluate yourself since you are your own best critic.