Which of the following sentences is the correct answer to "It must be our boss"？A．No, it c

Which of the following sentences is the correct answer to "It must be our boss"？

A．No, it can"t be him.

B．No, it mustn"t be him.

C．No, it needn"t be him.

D．No, it doesn"t have to be him.

请帮忙给出正确答案和分析，谢谢！