What type of graph represents the sequence given by the explicit formula an=-1 + (n-1)1/3}? A. A linear graph that slants upward left to right with a slope of 1/3 B. A linear graph that slants downward left to right with a slope of 1/3 C. A positive exponential curve that increases by a ratio of 1/3 D. A negative exponential curve that decreases by a ratio of 1/3