N his teaching and writings, Belgian designer Henri van de Velde became a vital source for the development of twentieth-century architecture and design theory. He taught that all branches of art share a common language of form and are of equal importance to the human community. He demanded . He saw ornament not as decoration but as a means of expression that could achieve the status of art.

A. appropriate materials, functional forms, and unity of visual organization.

Explanation:

Architecture is an art that is designed for the buildings. This is a macro level of the total built of environment and buildings to the level of micro in which furniture and material design included.

This profession needs more experienced and trained architecture who have depth knowledge of assessment, technical analysis and strategy development for the existing structure.

It is a multidisciplinary profession. This is the integrated skills of math, art, and science. It gives an additional feature to building such as aesthetics and expression of the building.

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explanation:

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answer; participant observation method;