What questions can Landlord ask you?

Can a landlord ask for my Social Insurance Number (SIN)?
 Many people think that a SIN is necessary for this process, but according to Equifax, a Canadian Credit Bureau, this is not true. If a landlord is demanding that you provide them with your SIN, you can either refuse and maybe not get that apartment, or ask them how they will protect your SIN in their records, so that it is not easily accessible

can landlord ask about basic information?
Many landlords want to check your credit rating before they will rent you an apartment
A landlord can check your credit history with your full name, current address