Wendy is logging the number of video game levels she wins per hour. she has determined the function to be f(x) = 6x + 9, where x represents hours and f(x) represents the number of video game levels won. which of the following options describes the restrictions to the domain and range correctly?

a) domain, nonnegative values; range, values greater than −1.5
b) domain, nonnegative values; range, values less than −1.5
c) domain, nonnegative values; range, values greater than or equal to 9
d)domain, nonnegative values; range, values less than or equal to 9