To plot the function f(x) = over [0,5]. we use 2x fplot('exp^(-x) /2*x',[0,5]) fplot('exp(-x)/2*x',[0,5) fplot ('exp(-x)/(2*x)',[0,5]) fplot('exp^(-x)/(2*x)",[0,5]) If a and e are two vectors of the same length, what does the following code find? function [p)- functionl (a.c) p=sum(a.*c); end It finds the cross product of a and c It finds the dot product of a and c It does nothing since there is an error It finds the sum of the components of a and c