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A plane in space contains the points P,Q and R with the following coordinates:
P=(1,0,2)
Q=(0,2,4)
R=(−1,−1,−2)

Which one of the following equations describes this plane?
a. 4x−y+2z=8
b. 4x−y−2z=0
c. 6x−8y−5z=−4
d. 6x+8y−5z=−4