Find the unit vector having the same direction as v.v = -24i + 24j -12k
A. 
= 
i + 
j + 
k
B. 
= - 
i + 
j - 
k
C. 
= - 
i + 
j - 
k
D. 
= - 
i + 
j - 
k
Answer: D
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