Mashaal Masha
$$57x^{2}+(57b+a)x+ab=0$$

In the given equation, $a$ and $b$ are positive constants. The product of the solutions to the given equation is $kab$, where $k$ is a constant. What is the value of $k$?
Difficulty: Hard
A: 

$\frac{1}{57}$

B: 

$\frac{1}{19}$

C: 

$1$

D: 

$57$

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