CHEMISTRY: Ksp Related concept question, plz help

Pure water is saturated with PbCl2. In this saturated solution:

1. [Pb2+] = [Cl−]
2. [Pb2+] [Cl−] = Ksp
3. 2 [Cl−] = [Pb2+]
4. Ksp = [Pb2+]
5. [Pb2+] = 0.5 [Cl−]

**the answer is definitely not choice 3!

for this dissolution..
AxBy ----> xA + yB

Ksp = [A]^x [B]^y

so...for this problem...
Ksp = [Pb+2] x [Cl-]²

as to the choices..
(1) is incorrect.. there are 2 Cl's for every 1 Pb.. ie.. [Cl-] = 2 x [Pb+2]
(2) is incorrect..
(3) is incorrect
(4) is incorrect..
(5) is correct... concentration Pb = 1/2 the concentration of Cl..because 1 PbCl2 ---> 1 Pb + 2 Cl

The answer is (5) - there will be half as many lead ions as there are chlorine ions.