The fabrication method that joins together materials, usually metal, is known as
a. casting
c. cutting
b. milling
d. welding

The correct answer is (d.) welding. Welding is a fabrication method that joins together materials, usually metal. by causing fusion. This method melts the materials upon joining it together  for a specific temperature without melting the base metal.

The process of cell division is different in prokaryotes and eukaryotes as prokaryotes have a primitive cell structure which is not membrane bound. In eukaryotes the process of cell division is termed as mitosis. In prokaryotic cells like a bacterial cell, the cell divides by a process called binary fission, where each cell is cleaved into two identical cells each with its own chromosomal set.  Budding is process of asexual reproduction and is different from cell division.

Therefore, the correct answer will be a. binary fission.