The magnitude and direction of the acceleration produced in a body of mass $5 \text{ kg}$ when two mutually perpendicular forces $8 \text{ N}$ and $6 \text{ N}$ act on it, are respectively:

• A
  $2 \text{ ms}^{-2}$; $\tan^{-1}(3/4 \text{ with } 8 \text{ N force})$
• B
  $2 \text{ ms}^{-2}$; $\tan^{-1}(4/3 \text{ with } 8 \text{ N force})$
• C
  $2 \text{ ms}^{-2}$; $\tan^{-1}(3/4 \text{ with } 6 \text{ N force})$
• D
  $20 \text{ ms}^{-2}$; $\tan^{-1}(4/3 \text{ with } 8 \text{ N force})$