The graph shows two types of the population growth curve, 'a' - Exponential and 'b' - Logistic. Which of the following graph models is considered to be the more realistic one?

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(i) A—Exponential growth curve and B—Logistic growth curve
(ii) Logistic growth curve B is considered more realistic one because the resources are finite and become limited sooner or later.
(iii) K stands for carrying capacity which refers to the maximum number of individuals of a population that the given environment can sustain at a given time.
(iv) N symbolises population density, i.e. the number of individuals of a species in a given population per unit area.

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