How do I solve this?

Suppose you have a function f(t) you want to integrate over the time period t = 3 to t = 15 with At = 2. Which of the following table rows has the correct information for using left, right, midpoint and trapezoid sums to solve this problem? Uses f(3) Uses f(5) Uses f(14 ) Uses f(15) Left Sum Yes Yes Yes Yes Right Sum No No No No Midpoint Sum No No No Yes Trapezoid Sum No Yes No No O a) All are correct. O b) Only Left Sums and Midpoint Sums are correct. O c) Only Left Sums and Trapezoid Sums are correct. O d) Only Left Sums are correct. O e) Only Right Sums and Trapezoid Sums are correct. O f) None are correct