The solution to the equation dy/dt=0.05y(80-y) with y(0)=4 a) y= 10/1+4e^-4t b) y= 20/1+4e^4t c) y= 10/1+5e^-4t d) y= 20/1+4e^-4t e) y= 20/1-4e^-4t