Read the following passage and solve the questions based on it.
Sourav’s Fish Salon serves a special Friday night sea-food banquet consisting of seven courses: hilsa, pomfret, Indian shrimp, rahu, kingfish, lobster, and bhetki. Diners are free to select the order of the seven courses, according to the following conditions:
(i) The kingfish is served sometimes after rahu.
(ii) Exactly one course should be served between the pomfret and the Indian shrimp.
(iii) The lobster is served some time before the pomfret.
(iv) The kingfish is either the fifth or the course to be reserved sixth. The hilsa is the second course to be served.
If bhetki is the third course served, which one of the following must be true?