Which of the following is NOT a type of lien?

The correct option, which identifies a choice that is not a type of lien, is the equity lien. Equity liens do not exist in the context of types of encumbrances that legally claim an interest in a property.

Liens are usually created through legal mechanisms and are classified depending on their origin and enforcement. For instance, a mortgage lien arises when a borrower takes out a loan to purchase property, giving the lender a claim to the property until the loan is repaid. Similarly, a judgment lien is imposed following a court ruling that requires an individual to pay a debt, allowing the creditor to claim against the debtor's property. Tax liens are placed by governmental authorities to secure payment of taxes owed.

The term "equity lien" is not recognized in real estate law, making it the correct answer as it does not fit into the established categories of property encumbrances. Understanding the nature of these actual liens helps clarify what constitutes an encumbrance in property law, reinforcing the significance of accurate terminology in legal discussions.