A wave on a string is moving to the right. This graph of y(x, t) versus coordinate x for a specific time t shows the shape of part of the string at that time. At this time, the velocity of a particle on the string is upward at U 3 4 O O 2 O point 1 and point 4 only. O point 3 and point 5 only. O three or more of points 1, 2, 3, 4, 5, and 6. O only one of points 1, 2, 3, 4, 5, and 6. O point 2 and point 6 only