\textbf{Standard deviation for Y=ax+b is SD(Y)=\textbar a\textbar SD(x).} 
\textbf{Research indicates that the standard deviation of typical human body temperature is 0.4 degree Celsius (C). which of the following represents the standard deviation of typical human body temperature in degrees Fahrenheit (F), where $$F=\frac{9}{5}C+32$$?} 

a. $$\frac{9}{5}(0.4)+32$$ 
b. $$\frac{9}{5}(0.4)$$ 
c. $$\frac{9}{5}(0.4)^{2}$$ 
d. $$\frac{9}{5}^{2}(0.4)$$ 
e. $$\frac{9}{5}^{2}(0.4)^{2}$$ 