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A light is mounted on a wall 5 meters above the ground. A 2 meter tall person is initially 10 meters from the wall and is moving towards the wall at a rate of 0.5 m/sec. After 4 seconds of moving is the tip of the shadow moving towards or away from the person? Select one: a, towards the person at a rate of 1/2 m/s b. away from the person at a rate of 1/2 m/s O c. away from the person at a rate of 1/3 m/s O d. towards the person at a rate of 1/3 m/s