Identify the combination of mechanisms which best describes sintering of pure metals in powder metallurgy.
P. Grain boundary melting
Q. Liquid metal freezing
R. Interparticle melting
S. Recrystallisation
T. Grain growth
U. Oxidation
V. Reduction
A. S and I
B. P and Q
C. R and Q
D. U and V
Answer: Option D
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