B. Fiber forming
D. Slip casting
I had been asked this question in an online interview.
Origin of the question is Ceramic Formation & Clay Ceramics topic in chapter Composite & Ceramic Materials of Engineering Material & Metallurgy
Explanation: Slip casting, along with hydro-plastic forming and powder pressing, is a particulate forming process of ceramic fabrication. All the processes of particulate forming undergo drying and firing operations. Drying process removes the liquid, whereas firing improves its density and strength.