If the Holmans consider the two IRAs plus other non$-$retirement investments, and Linda's retirement plan $($a total value of $$345,000)$ as assets dedicated for retirement in $6$ years, and that they will earn a $7\mathrm{.}5\%$ rate of return, what is the future value of these investments?

A$)$

$$436,535$

B$)$

$$429,794$

C$)$

$$532,439$

D$)$

$$345,000$