Inflation$-$adjusted securities issued by the U$.$S$.$ Treasury where the principal is adjusted according to the Consumer Price Index $($CPI$)$ and, at maturity, the investor receives the inflation$-$adjusted principal or the original principal, whichever is greater, are called:

A STRIPS $($Separate Trading of Registered Interest and Principal of Securities$)$

B Put bonds

Variable rate bonds

TIPS $($Treasury Inflation$-$Protected Securities$)$