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Given the polar equation $r=-4,$ find all values of $\theta$ on the interval $[0,2\pi]$ where the line tangent to the graph has a slope of $1$.

$\cfrac{\pi}{4}$

$\cfrac{3\pi}{4}$

$\cfrac{\pi}{4}\quad \text{and}\quad \cfrac{5\pi}{4}$

$\cfrac{3\pi}{4}\quad \text{and}\quad \cfrac{7\pi}{4}$