In multiple nuclei model which of the following zone is not continuous to the city and develops at outer margin in isolation.

Correct option is D

The correct answer is: (d), Residential suburbs
Multiple nuclei model
Multiple nuclei model of 1945 by C.D.Harris and Edward Ullman are based on the argument that the cities have multiple growth points or nuclei around which growth take place. It serves as an alternative to the concentric zone model and the sector model in explaining urban land use patterns.
This model is based on the structure of Chicago just like the burgess model or concentric zone model of 1925.

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Other settlement model
The Concentric Zone Model, also known as the Burgess Model, is a theoretical urban land use model developed by sociologist Ernest Burgess in 1925. It describes the spatial arrangement of land use patterns within cities based on concentric rings radiating outward from a central business district (CBD). The model suggests that cities grow in a series of concentric circles, with different land uses occupying each zone.
The Sector Model, also known as the Hoyt Model, is another urban land use model proposed as an alternative to the Concentric Zone Model by economist Homer Hoyt in 1939. This model suggests that cities develop in a series of wedges or sectors radiating outward from the central business district (CBD), rather than in concentric rings.
In the Sector Model, the city is divided into sectors or wedges based on transportation routes, topography, and land values. Each sector is characterized by different land use patterns and socio-economic activities.