premise: Shanti interviews exactly five out of a total of seven job applicants—Gopi, Irfan, Lata, Nasser, Oscar, Rohit, and Tarun. She interviews the five one at a time, once each. Interviewing must meet the following conditions: Lata is interviewed second or third. Nasser or Tarun is interviewed last. Gopi, if interviewed, is interviewed first. Irfan is interviewed immediately after Rohit if both are interviewed. Oscar is interviewed immediately after Rohit if both are interviewed. Tarun is interviewed immediately after Nasser if both are interviewed. Suppose the condition that Nasser or Tarun is interviewed last is replaced with the condition that neither Nasser nor Tarun is interviewed last. If all the other initial conditions remain in effect, then which one of the following must be true if Rohit is interviewed last?
hypothesis: Irfan is interviewed fourth.