What does this spreadsheet formula mean? $=$sum $(A1$:$F1)$

A$)$ Calculate the sum of the values in cells A$1$ and F$1.$

B$)$ Calculate the sum of the values in cells A$1$ through F$1.$

C$)$ Calculate the sum of the values in all cells except A$1$ and F$1.$

D$)$ Calculate the sum of the values in all cells except A$1$ through F$1.$