The sum of all the natural numbers for which $log_{(4-x)}(x^2 -14x + 45)$ is defined is -
The sum of all the natural numbers for which $log_{(4-x)}(x^2 -14x + 45)$ is defined is -
- A
$1$
- B
$2$
- C
$3$
- D
$4$
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