The debt is amortized by the periodic payment shown. Compute the outstanding principal at the time indicated if the number of payments is $16.$

$\backslash$table$[[\backslash$table$[[$Debt$],[$Principal$]],\backslash$table$[[$Debt$],[$Payment$]],\backslash$table$[[$Payment$],[$Interval$]],\backslash$table$[[$Interest$],[$Rate$]],\backslash$table$[[$Conversion$],[$Period$]],\backslash$table$[[$Outstanding Principal$],[$After:$]]],[$$$17,000,$$$1,289,3$ months,$9\%,$monthly,$7$th payment$]]$

a$)$ $$10,889\mathrm{.}90$

b$)$ $$10,227\mathrm{.}23$

c$)$ $$10,500\mathrm{.}00$

d$)$ $$10,300\mathrm{.}00$