Let ${\bf f}:{\mathbb R}^2\rightarrow {\mathbb R}^2$ be a continuously differentiable function, where ${\mathbb R}^2$ denotes the set of all points ${\bf x}=(x_1,x_2)$ in the Euclidean plane.

Consider the autonomous differential equation ${\bf x}'={\bf f}({\bf x})$.

Choose the **BEST** answer.

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