Final answer:
The 'fibby' method for nonnegative values likely refers to the Fibonacci sequence, not exponential growth. The Fibonacci sequence grows by adding the two previous numbers, contrasting with exponential growth, where the quantity grows by a constant proportion over time.
Step-by-step explanation:
The method 'fibby' that accepts an integer for nonnegative values is likely referring to the Fibonacci sequence, which is characterized by each number being the sum of the two preceding ones, starting from 0 and 1. This is option (b) from the choices provided. The Fibonacci sequence does not represent exponential growth, linear progression, or a logarithmic scale.
In contrast, exponential growth is defined as the growth in which the rate of growth is constant and the quantity grows by a constant proportion at each time interval. For example, a population that doubles every month is experiencing exponential growth. The calculation for this growth after 'n' periods can be represented as 2n, where 'n' is the number of time intervals.