The length of the latus rectum of the ellipse $9{x^2} + 4{y^2} = 1$, is
The length of the latus rectum of the ellipse $9{x^2} + 4{y^2} = 1$, is
- A
$\frac{3}{2}$
- B
$\frac{8}{3}$
- C
$\frac{4}{9}$
- D
$\frac{8}{9}$
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