The graph below shows the average annual population growth rates for three distinct zones of a major UK metropolitan region (Inner City, Suburbs, and Rural-Urban Fringe) across three distinct historical periods:

Which option correctly identifies the dominant urban processes represented by the peak of Curve Y in the period 1950–1970, and the peak of Curve Z in the period 1980–2000?
Curve Y: Suburbanisation; Curve Z: Counter-urbanisation\text{Curve Y: Suburbanisation; Curve Z: Counter-urbanisation}Curve Y: Suburbanisation; Curve Z: Counter-urbanisation
Curve Y: Re-urbanisation; Curve Z: Suburbanisation\text{Curve Y: Re-urbanisation; Curve Z: Suburbanisation}Curve Y: Re-urbanisation; Curve Z: Suburbanisation
Curve Y: Urban Resurgence; Curve Z: Counter-urbanisation\text{Curve Y: Urban Resurgence; Curve Z: Counter-urbanisation}Curve Y: Urban Resurgence; Curve Z: Counter-urbanisation
Curve Y: Suburbanisation; Curve Z: Re-urbanisation\text{Curve Y: Suburbanisation; Curve Z: Re-urbanisation}Curve Y: Suburbanisation; Curve Z: Re-urbanisation