Answer:
A. AA-rated revenue bond that is escrowed to maturity
Step-by-step explanation:
As first option is the bond that the issuer of bond called back prior to the matured. It occurs when there is a fall in the rate of interest
The second option is backup by a pledge that involves full trust and contains the secure option that enables an individual free from the federal income tax
The third option are issued by the authorities that are local and governed by the U.S government so it become secure that enables an individual free from the federal income tax
The fourth option is the mix of revenue bonds and the obligation bonds hat involves full trust and contains the secure option that enables an individual free from the federal income tax