The question asks for the term describing the process of determining the best use and arrangement of land and structures on a specific site.
Let's evaluate the options:
(a) Zoning: Zoning is a land use planning tool used by local governments to regulate how land can be used in different areas (zones) of a city or region (e.g., residential, commercial, industrial zones). It sets rules for permitted uses, building density, height, setbacks, etc. While it influences what can be built on a site, it's a regulatory framework, not the process of determining best use/arrangement *on* a specific site by a designer/planner.
(b) Programming (Architectural Programming): This is an early phase in the architectural design process. It involves thoroughly identifying and defining the client's and users' needs, goals, activities, space requirements, and functional relationships for a proposed building or project. It establishes the criteria and requirements that the design must meet. It's about defining *what* needs to be built, rather than *how* it's arranged on site.
(c) Site analysis: Site analysis is the process of studying the specific characteristics and context of a site to understand its opportunities and constraints for development. This includes evaluating factors like topography, climate, views, access, existing vegetation, soil conditions, surrounding land uses, infrastructure, legal restrictions (including zoning), and cultural context. The findings of site analysis inform decisions about the "best use and arrangement of land and structures on a site" to create a responsive and appropriate design. It is a crucial precursor to site planning and design.
(d) Landscaping (Landscape Architecture): Landscaping refers to the design, planning, and management of outdoor spaces, including planting, landforms, water features, paving, etc., to create functional and aesthetically pleasing environments. While it involves arranging elements on land, "site analysis" is the broader process that informs these landscaping decisions as well as building placement.
The process of thoroughly investigating a site's conditions and potential to determine the optimal use and layout of proposed development is most accurately termed Site analysis. The outcome of site analysis directly leads to site planning and design decisions about use and arrangement.
\[ \boxed{\text{Site analysis}} \]