Find the derivative of the function z=5t^(11/5)-2t^(9/4)-t^(1/2)+2z^('). Which of the following is the correct derivative of the function?

A) 5t^(11/5)-2t^(9/4)-t^(1/2)+2z^(')
B) 5t^(11/5)-2t^(9/4)-t^(1/2)
C) 5t^(11/5)-2t^(9/4)
D) 5t^(11/5)