Calculate the direction of 
and the midpoint of line segment P1P2. P1(-8, -5, -8) and P2(-4, -8, -13)
A. 
i - 
j - 
k; 
B. 
i + 
j + 
k; 
C. 
i + 
j + 
k; 
D. 
i - 
j - 
k; 
Answer: B
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