In the diagram, the resultant $R$ of a $3.0\,\text{N}$ force and a $4.0\,\text{N}$ force applied at a single point is shown. The angle separating the $3.0\,\text{N}$ force and the $4.0\,\text{N}$ force may take any value from $0^\circ$ to $90^\circ$. Which value of $R$ cannot occur?
- A$4.0\,\text{N}$
- B$5.0\,\text{N}$
- C$6.0\,\text{N}$
- D$7.0\,\text{N}$