The two inputs of a CROare fed with two stationaryperiodic signals. In the X-Ymode - the screen shows afigure which changes fromellipse to circle and back toellipse with its major axischanging orientation slowlyand repeatedly. Which of thefollowing inference can bemade from this?

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The two inputs of a CROare fed with two stationaryperiodic signals. In the X-Ymode - the screen shows afigure which changes fromellipse to circle and back toellipse with its major axischanging orientation slowlyand repeatedly. Which of thefollowing inference can bemade from this?