The mean return of a portfolio is 20% and its standard deviation is 4%. The returns are normally distributed. Which of the following statements about this distribution are least accurate The probability of receiving a return:（）

A. of less than 12% is 0.025.

B. between 12% and 28% is 0.95.

C. in excess of 16% is 0.16.

超过筹资分界点筹资，只要保持原有资金结构，其资金成本率就不会发生增长。（）