Solve the problem.Find equations for the horizontal and vertical tangent lines to the curve 
A. Horizontal: 
at 
, 
at 
, 
at 
, 
at 
; vertical: 
at 
at 
at 
, 
at 
B. Horizontal: 
at 
, 
at 
, 
at 
, 
at 
; vertical: 
at 
at 
at 
, 
at 
C. Horizontal: 
at 
, 
at 
, 
at 
, 
at 
; vertical: 
at (3, 0), x = 1 at (-1, ?), 
at 
, 
at 
D. Horizontal: 
at 
, 
at 
, 
at 
, 
at 
; vertical: 
at 
at 
at 
, 
at 
Answer: A
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