A body is at rest at x = 0. At t = 0, it starts moving in the positive x-direction with a constant acceleration. At the same instant another body passes through x = 0 moving in the positive x- direction with a constant speed. The position of the first body is given by $x_1$(t) after time ‘t’ and that of the second body by $x_2$(t) after the same time interval. Which of the following graphs correctly describes $(x_1 – x_2)$ as a function of time ‘t’?

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