According to the man, a good public speakerA．should always remember his speech word by wor

According to the man, a good public speaker

A．should always remember his speech word by word.

B．usually resorts to topic cards and pictures.

C．might prepare some notes for his speech.

D．often makes a backup copy of the speech.

请帮忙给出正确答案和分析，谢谢！