The equivalent load (f) acting on a simply supported beam element loaded with uniformly distributed load (p) over an element of length (l) is given by which of the following expressions?

• A. f= ([ frac{pl}{2}, frac{pl^2}{12}, frac{pl}{2},- frac{pl^2}{12}] )
• B. f= ([ frac{pl}{2}, frac{pl^2}{12}, frac{pl}{2}, frac{pl^2}{12}] )
• C. f= ([ frac{pl}{2},- frac{pl^2}{12}, frac{pl}{2},- frac{pl^2}{12}] )
• D. f= ([ frac{pl}{2}, frac{pl^2}{12}, frac{-pl}{2},- frac{pl^2}{12}] )