The value in cell A$1$ is $3$ and A$2$ contains $6.$ The AutoFill command is then used to fill$-$in cells A$3$ to A$5.$ The formula $=$ SUN$($A$1$:A$5)$ is next entered in cell B$1.$ What will be displayed in cell B$1?$

A$.45$

B$.$ #REF!

C #NAME?

D$.$ #N$/$A