Text-based stimulus: A data chart titled "Branching Routine Counts" with x-axis n values 5, 10, 15, 20 and y-axis operation counts 32, 1024, 32768, 1048576. A chart for a recursive branching routine shows n = 5, 10, 15, 20 and operation counts = 32, 1,024, 32,768, 1,048,576. Which growth rate is the best match?