What is the condition on kkk such that the lines x+y+1=0x + y + 1 = 0x+y+1=0, 2x+y+3=02x + y + 3 = 02x+y+3=0, and kx+2y+1=0kx + 2y + 1 = 0kx+2y+1=0 are concurrent?
k=3k = 3k=3
k=4k = 4k=4
k=5k = 5k=5
k=6k = 6k=6