Find the indicated derivative for the given vector-valued function .Find Dtr(t) for r(t) = (4t4 + 5t3 - 1)i + 7k.
A. Dtr(t) = (16t3 + 15t2)k
B. Dtr(t) = (16t3 + 15t2)i + k
C. Dtr(t) = (16t3 + 15t2)i
D. Dtr(t) = (4t3 + 3t2 - 7)i + k
Answer: C
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