For which values of kkk does the inequality kx2+2kx+3>0kx^2 + 2kx + 3 > 0kx2+2kx+3>0 hold for all real xxx?
k>3k > 3k>3
0<k<30 < k < 30<k<3
0≤k<30 \leq k < 30≤k<3
k<0k < 0k<0