Determine the standard equation of the hyperbola with the given characteristics.A focus is at (4, 2), and the vertices are at (10, 2) and (8, 2).
A. 
- (y - 9)2 = 1
B. 
- (y - 2)2 = 1
C. (x - 2)2 - 
= 1
D. (x - 9)2 - 
= 1
Answer: D
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