Not later than 6 months after the effective date of this part, a city having a population of 750,000 or more shall select an option permitted under this section in a manner consistent with its charter and shall notify the department of the city’s intent to do 1 of the following:

  (a) Create a city health department pursuant to a plan developed under section 2424.

  (b) Join with the county or district in which the city is located to create a district health department pursuant to section 2415 and a plan developed under section 2424.

  (c) Decline to exercise the options in subdivision (a) or (b), in which case the local health department otherwise having jurisdiction in the county in which the city is located, pursuant to a plan developed under section 2424, shall assume the powers and duties of a local health department in the city.