Which of the following are considered types of municipal bonds?

Revenue bonds are indeed considered a type of municipal bond because they are issued by governmental entities to finance specific projects or facilities, and their repayment is derived from the revenues generated by those projects. This makes them distinct from general obligation bonds, which are backed by the full faith and credit of the issuing municipality and typically financed through taxes.

Municipal bonds, in general, are used to fund public projects such as the construction of schools, highways, or hospitals, and are key components of local and state financing. Revenue bonds specifically are tied to a particular revenue stream, such as tolls from a highway or payment from a user fee, making them an important financial tool for municipalities seeking to fund essential infrastructure.

Collateral trust bonds and debentures are not classified as municipal bonds. Collateral trust bonds are usually secured by specific assets or financial instruments, and debentures are unsecured bonds that are backed only by the issuer's creditworthiness, typically associated with corporations rather than municipalities.