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Write $\log_3(x+3)+\log_3(x+1)$ as a single logarithm.

$\log_3\left(\cfrac{x+3}{x+1}\right)$

$\log_3\left((x+3)(x+1)\right)$

$\log_3(2x+4)$

$\log_3(x+3)\cdot\log_3(x+1)$

It cannot be written as a single logarithm

None of these