What must be furnished to purchasers of new municipal issues at or prior to settlement?

The correct response is that purchasers of new municipal issues must receive the Final Official Statement or a summary if the Full Official Statement is not provided. The Final Official Statement is a critical document as it offers detailed information about the bond issue, including its terms, risks, and other essential data that informs the investor before they make a purchase decision.

When a summary is provided instead of the full document, it must be sufficiently comprehensive to contain the key elements that would enable an investor to make an informed analysis. This requirement ensures transparency and promotes informed investment in municipal securities.

Other options like only providing the Final Official Statement or solely the Legal Opinion are not sufficient for compliance with the regulatory requirements pertaining to municipal securities sales. Moreover, the Official Notice of Sale does not encompass the entire scope of disclosure necessary before settlement, hence less relevant in this context.