Consider any point P on the ellipse \(\frac{{{{\rm{x}}^2}}}{{25}} + \frac{{{{\rm{y}}^2}}}{9} = 1\) in the first quadrant. Let r and s represent its distance from (4, 0) and (-4, 0) respectively, then (r + s) is equal to

• A. 10 unit
• B. 9 unit
• C. 8 unit
• D. 6 unit