If x2−4x+k=0x^2 - 4x + k = 0x2−4x+k=0 has two real solutions for xxx, what is the range of kkk?
k≤4k \le 4k≤4
k<4k < 4k<4
k≥4k \ge 4k≥4
k>4k > 4k>4