Find the first derivative of the signal. X(t) = t[u(t) – u(t – a)], a > 0

• A. u(t) + u(t – a) – aδ(t –a)
• B. u(t) – δ(t – a)- aδ(t – a)
• C. u(t) – u(t – a) + aδ(t – a)
• D. u(t) – u(t – a) –aδ(t – a)