Gregor is documenting the height of pea plants each week. he has determined the function to be f(x) = 2x + 1, where x represents time and f(x) represents the height of the plant. which of the following options describes the restrictions of the domain (x) and range f(x) correctly?

a. domain, nonnegative values; range, values greater than -0.5
b. domain, nonnegative values; range, values less than -0.5
c. domain, nonnegative values; range, values greater than 1
d. domain, nonnegative values; range, nonnegative values