Anna buys trees from a nursery that cost $5.95 each. she has a maximum of $40 to spend on her tree purchases. the total cost, with respect to the number of trees purchased, can be modeled by a function. select the statement that correctly describes the domain of the function. a. the domain is the set of all integers greater than or equal to 0 and less than or equal to 6. b. the domain is the set of all integers greater than or equal to 0 and less than or equal to 7. c. the domain is the set of all real number greater than or equal to 0 and less than or equal to 35.7 d. the domain is the set of all real numbers greater than or equal to 0 and less than or equal to 40.