5. Express the given function using unit step function: * [t f (t) = 0st<4 2 , t24 O A.) f (t) = t -tu (t - 4) – 2u (t – 4) O B.) f (t) = t +tu (t - 4) – 2u (t - 4) O c.) f (t) = t + tu (t – 4) + 2u (t - 4) O D.) f (t) = t -tu (t - 4) + 2u (t – 4)

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