Which type of deposit is paid in advance to protect landlords against nonpayment?

The answer is the security deposit.

Step-by-step explanation:  We are to state the type of deposit which is to be paid in advance to protect landlords against nonpayment.

We pay a deposit of money to the landlord to ensure that rent will be paid in time and other responsibilities of the lease performed nicely. For example, paying for damage caused by the tenant, etc.

This type of deposit is called security deposit because it insures security to the landlord.

Thus, the answer is the security deposit.

i pretty sure it is