Which complex number will be located above the real axis and to the left of the imaginary axis?

a) 4i
b) 2-4i
c) 4i-1
d) -1-2i

An imaginary number is a number that has a variable "i" next to a real number. Hence, the complex number will be located above the real axis and to the left of the imaginary axis is 2-4i. The negative sign of 4i means that the imaginary number is on the left of the axis. 

I’m not sure what it is i sorry : ((