Find the unit tangent vector of the given curve.r(t) = (cosh t)i + (sinh t)j + k
A. T(t) = - 
(tanh t sech t)i + 
j + 
(sech t)k
B. T(t) = - 
(tanh t)i + 
j + 
(sech t)k
C. T(t) = 
(tanh t sech t)i + 
j + 
(sech t)k
D. T(t) = 
i + 
j
Answer: D
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A. 
B. 
C. 
D. 
E. none of these
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A. 
B. 
C. 
D. 