Write an Equation for the Graph Given $2 ^ { x - 2 } - 1$

Multiple Choice

Write an equation for the graph given. The graph represents an exponential function f with base 2 or 3, translated and/or reflected.
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A) $2 ^ { x - 2 } - 1$
B) $2 ^ { x + 2 } - 1$
C) $2 ^ { x + 2 } + 1$
D) $2 x - 2 + 1$