A、Dean Maple. B、A secretary. C、A receptionist. D、An operator. CWho was Mary talking to?

M: Good morning, the Dean’s office.
W: Hello, this is Mary Smith speaking. I was just calling before I left my dorm room to make sure that I had an appointment with Dean Maply this morning at 10:00 o’clock.
M: Please wait a minute. I’ll check with his secretary.
W: Ok, thank you.
M: Hello, Miss Smith.
W: Yes.
M: He looked at his calendar and he doesn’t have your appointment in his book for 10:00.
W: But...that’s impossible. Please check it again. I’m sure I have made an appointment with him.
M: Sorry, Miss Smith, I will call his secretary to check. By the way, when did you make the appointment?
W: On Tuesday, two days ago.
M: Wait a minute. Hello, Miss Smith, Dean Maply is waiting to see you at 10:00 o’clock and I’m sorry for that mistake.
W: Never mind. And thank you. I’ll be right over after breakfast.
M: All right, Good-bye.
W: Good bye.