Find the derivative of the function f(t) = te⁷ - 6t).
a) f'(t) = e⁷ ⁻ ⁶ᵗ - 6t
b) f'(t) =e⁷ ⁻ ⁶ᵗ - 6
c) f'(t) = e⁷ ⁻ ⁶ᵗ + 6t
d) f'(t) = e⁷ ⁻ ⁶ᵗ + 6