What is a government security issued in minimum units of $100 with maturities that are 4-week, 13-week, 26-week, and 52-week?

A treasury bill is a short-term government security that is issued at a discount to its face value and has maturities of 4-week, 13-week, 26-week, and 52-week. Investors buy these bills to receive a return when they mature; the difference between the purchase price and the face value at maturity constitutes the investor's earnings. Treasury bills are considered a safe investment since they are backed by the full faith and credit of the U.S. government. The minimum investment unit of $100 makes them accessible to a wide range of investors.

The other types of securities mentioned, such as municipal bonds and government bonds, cater to different investment criteria, such as longer maturities or tax considerations. Municipal bonds typically involve state or local government debt and usually have longer maturity dates, while government bonds refer to longer-term debt issued by the government, like Treasury notes and bonds, which also diverge from the defined short-term nature and maturity of treasury bills. Therefore, treasury bills are the correct identification for the given criteria.