Consider the second order differential equation: y" - 4y + 4y = 0 (in which y is a function of t). Which of the following is the characteristic equation of this differential equation? Select one alternative: A² 4X+4-0 A² 4X+4y=0 OX-4}+4=y X" 4X+4= 0 Which of the following is not a solution to the differential equation y' - 4y + 4y = 0? Select one alternative y = te²t y = 4e²t+te²t y = 4e²t Oy=t²e²t