Final answer:
Mortgage loans are the only type of secured loan in the given options, as they are backed by the house that serves as collateral. Personal loans, credit card loans, and payday loans are typically unsecured and do not require collateral. Auto loans, while not listed, are another example of secured loans.
Step-by-step explanation:
When it comes to identifying secured loans, we need to consider which loans are backed by assets that serve as collateral. Among the options given, mortgage loans are a type of secured loan, as they are protected by the physical property—the house—that acts as collateral. A bank views a mortgage as an asset because it entails a legal obligation for the borrower to make payments over time, such as in the case of a 30-year mortgage. This type of loan is made via the primary loan market and can be sold in the secondary loan market. On the other hand, personal loans and credit card loans are often unsecured, meaning they do not typically require backing by physical collateral like a house or car. Auto loans, although not listed in the choices, are another example of a secured loan where the collateral is the vehicle itself. Payday loans are also generally considered unsecured debt, as they are short-term loans based on an individual's personal check held for future deposit or on electronic access to the borrower's bank account.