Consider the following reaction mechanism: NO2 + NO, NO2 + NO step 1 (slow) step 2 (fast) NO3 + CO NO2 + CO2 k overall NO2 + CO + NO + CO2 Which of the following statement/s is/are TRUE? 1. Step 1 is the rate determining step. II. NO3 is the reaction intermediate. For the overall reaction, r= k[NO2][co] IV. Step 2 is first-order overall. O a. Only 1 is correct O b. III and IV are correct O c. I and II are correct O d. I, II and III are correct