Three-month Treasury Bonds (T-bill) are considered the safest investment opportunity. Which of the following describes the reason(s) most appropriately? Group of answer choices 1) Because its return is almost 100% guaranteed by the credibility of the Federal Government. 2) Because its return is almost 100% guaranteed in the shortest time period. 3) Because its yield rate is the lowest, the federal government can easily pay it back. 4) All of the above. 5) Both 1) & 2) above.