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This paper discusses the topology optimization and additive manufacturing ( AM ) specific re-design of a metallic C-frame as it is used in the riveting process in the automotive industry .
 engineering feature: topology optimization; manufacturing process: additive manufacturing; manufacturing process: AM; material: metallic; material: as; concept or principle: process; application: automotive industry
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: topology optimization, additive manufacturing, AM, metallic, as, process, automotive industry 
Answer:
 engineering feature: topology optimization; manufacturing process: additive manufacturing; manufacturing process: AM; material: metallic; material: as; concept or principle: process; application: automotive industry