Question 7 (3 points) Listen Which of the following is a proper recursive definition of x raised to the y power, assuming that y >= 12 1) XY = x *xY-1 for y> 1; xy = x for y = 1 O2) XY = x + xy_2 3) none of the above 4) XY - xxy-1 5) XY = x + xy-1 for all