Fill in the blanks based on the following reaction energy di…

Fill in the blanks based on the following reaction energy diagram of a multi-step reaction mechanism. In this reaction mechanism, there are [num1] (how many? Fill in the blank with a number) transition states; [num2] (how many? Fill in the blank with a number) reaction intermediates. [step] (step 1, step 2 or step 3?) is the rate determining step.