According to the experiments by Anta Rafaela and her graduates, which can be the best idea
A.To play background music to the callers in the purpose of speeding up the process.
B.To play ready made robotic apologies to ease the feelings of waiting callers.
C.To inform. the callers of their position in the phone line.
D.To tell the callers that they are moving near to the front of the line.