Which of these is likely to be the lien with the highest priority?

A mechanic's lien is placed on a property by contractors or subcontractors who have not been paid for work performed. While mechanic's liens can be significant, they typically rank below tax liens in priority because they are considered voluntary liens created through contractual agreements, unlike tax liens which are statutory.

An attachment lien is a court-ordered lien that allows a creditor to claim a debtor's property before a judgment is made. While it can be a powerful tool for creditors, it does not have the same statutory priority as tax liens, which are recognized and enforced by law to ensure tax collection.

Mortgages are loans secured by real estate, and while they represent a significant financial obligation, they are generally subordinate to tax liens. In the event of foreclosure or property sale, tax liens must be satisfied before mortgage claims can be addressed, illustrating their lower priority status.