WeBWorK Standalone Renderer

Match the vector fields with the graphs below.
(a) $\vec F_1 = y\,\mathit{\vec i}+x\,\mathit{\vec j}$ matches graph
(b) $\vec F_2 = -x\,\mathit{\vec i}+y\,\mathit{\vec j}$ matches graph
(c) $\vec F_3 = y\,\mathit{\vec i}-x\,\mathit{\vec j}$ matches graph
(d) $\vec F_4 = -x\,\mathit{\vec i}-y\,\mathit{\vec j}$ matches graph

For all graphs, vectors are shown as line segments, with a dot at the tail of the vector.