When a population's carrying capacity has been reached, which scenario is not likely to occur?

the population size will decrease because of death rate.
the population size will decrease because of emigration.
the population size will decrease because of birth rate.
the population size will decrease because of immigration.

I think that the scenario that is less likely to occur would be that the population size will decrease because of immigration because at the end of the day this country has immigrants coming and leaving every day. So I think that If a population has reached its capacity the population will not decrease because of immigration because yes immigrants will leave...but some will come back.