What Is the Best Way to Address a Client's Potential

What is the best way to address a client's potential financial difficulties in paying for veterinary services?

A) Say, "How will you be paying for today's visit? We accept cash, checks, and credit cards."
B) Provide an estimate before the client consents to treatment.
C) Give the client the bill at the end of the visit and do not offend him or her by inquiring about money beforehand.
D) Insist on full payment before an examination is initiated.