Below are the year$-$end balance sheets for Wolken Enterprises. Wolken has never paid a dividend on its common stock, and it issued $$2,400,000$ of $10-$year non$-$callable, long$-$term debt in $2014.$ As of the end of $2015,$ none of the principal on this debt had been repaid. Assume that the company's sales in $2014$ and $2015$ were the same. Which of the following statements must be CORRECT?

a$.$ Wolken increased its short$-$term bank debt in $2015.$

b$.$ Wolken issued long$-$term debt in $2015.$

c$.$ Wolken issued new common stock in $2015.$

d$.$ Wolken repurchased some common stock in $2015.$

e$.$ Wolken had negative net income in $2015.$

$\backslash$table$[[$Assets:$,{2015}_{?},{2014}_{?}$