Suppose an Exxon Corporation bond will pay $$1,000$ ten years from now. If the going interest rate on safe $10-$year bonds is $7\mathrm{.}00\%,$ how much is the bond worth today?

a$.$ $$483\mathrm{.}98$

b$.$ $$475\mathrm{.}09$

c$.$ $$508\mathrm{.}35$

d$.$ $$502\mathrm{.}57$

e$.$ $$543\mathrm{.}93$