Given the graph of F(t) below, which of the following is F(t)? [u(t) is the Heaviside step function.] (A) -t+2tu(t-1) (B)-t+tu(t-1)-u(t-1) (C)-t+tu(i-1)+u(t-1) (D)-t-tu(t)+u(t-1) 1 0 -1

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