Which of the following processes is the least isotropic (least smooth) in the vertical direction?
a)Fused Deposition modeling (FDM)
b)Selective Laser Sintering (SLS)
c)Direct Metal Deposition (DMD)
d)Multi-Jet Printing (MJP)
e)Stereolithography (SLA)
f)Direct Metal Laser Sintering (DMLS)