Compute r"(t). r(t) = (3 In (7t)i + (9t) O A. r() = --2i+54j 3 -21+54tj 3 O B. r"(t) =-i+27tj Oc. r"(t) = -Gi+54tj O D. r"(t) = 3 - t²i+54tj

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