The positive integer $k$ has exactly two positive prime factors $3$ and $7.$ If $k$ has a total of $6$ positiv

The positive integer $k$ has exactly two positive prime factors $3$ and $7.$ If $k$ has a total of $6$ positive factors including $1$ and $k,$ what is the value of $k?$

(1) $9$ is a factor of $k.$
(2) $49$ is a factor of $k.$

Answer: D

Source: GMAT Prep

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