The max value of the slope of the tangent line to the curve of f(x)= -1/3x^3+3x^2-5x A) 4 B) 5 C) 25/3 D) 3 pls show work

The max value of the slope of the tangent line to the curve of f(x)= -1/3x^3+3x^2-5x

A) 4

B) 5

C) 25/3

D) 3

pls show work