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$$F=P+P r t$$$\newline$For an investment that bears simple interest, one can predict future value $F$ after $t$ years if the principal or initial amount invested $P$ and annual interest rate $r$ are known, by using the given equation. Which of the following correctly expresses the principal amount in terms of the annual rate, number of years invested, and future value?$\newline$Choose $1$ answer:$\newline$(A) $P=\frac{F}{1+r t}$$\newline$(B) $P=\frac{F}{1-r t}$$\newline$(C) $P=\frac{F+P}{r t}$$\newline$(D) $P=\frac{F-P}{r t}$