Answer: The correct answer is (a) 2.
Step-by-step explanation: The given polynomial function has a degree of 4, meaning that it is a quartic function. The leading coefficient of the function is negative, indicating that the graph will be down-facing. The constant term is also negative, suggesting that the graph will intersect the x-axis in the negative x-region. Furthermore, since the degree of the function is even, it means that the graph will be symmetric about the y-axis. Finally, based on the intermediate value theorem, we can conclude that the function has at least one real zero between x = 0 and x = 1.