If(secx)(tanx) < 0, which of the following must be true?

I. tanx <0

II. scsx cotx < 0

III. x is in the third or fourth quadrant

So I first simplified secx * tanx into sinx/cos^2x using the property that tanx = sinx/cosx, and then i graphed it on my calculator, but I'm not sure what to do next.