The correct answer is: D. Cost per linear metre method.
The cost per linear metre method is a method of estimating the cost of a project by multiplying the length of the project
by the unit cost per linear metre. This method is often used for projects that have a long linear dimension, such as roads, pipelines, and fences.The base unit method is a method of estimating the cost of a project by multiplying the number of base units in the project by the unit cost per base unit. This method is often used for projects that have a large number of similar components, such as buildings and bridges.
The cost per function method is a method of estimating the cost of a project by multiplying the number of functions in the project by the unit cost per function. This method is often used for projects that have a complex set of requirements, such as hospitals and schools.
The cost per square metre method is a method of estimating the cost of a project by multiplying the area of the project by the unit cost per square metre. This method is often used for projects that have a large area, such as floors and roofs.
In the case of perimeter works for buildings, the cost per linear metre method is the most appropriate method to use. This is because perimeter works are typically linear in nature, and the cost of these works is often proportional to the length of the perimeter.