Below are the $2020$ and $2021$ year$-$end balance sheets for Tran Enterprises:

Assets:$20212020$Cash$ $200,000$$ $170,000$Accounts receivable$864,000700,000$Inventories$2,000,0001,400,000$Total current assets$$3,064,000$$$2,270,000$Net fixed assets$6,000,0005,600,000$Total assets$$9,064,000$$$7,870,000$

Liabilities and equity:

Accounts payable$$1,400,000$$$1,090,000$Notes payable to bank$1,600,0001,800,000$Total current liabilities$$3,000,000$$$2,890,000$Long$-$term debt$2,400,0002,400,000$Common stock$3,000,0002,000,000$Retained earnings$664,000580,000$Total common equity$$3,664,000$$$2,580,000$Total liabilities and equity$$9,064,000$$$7,870,000$

The firm has never paid a dividend on its common stock, and it issued $$2,400,000$ of $10-$year, non$-$callable, long$-$term debt in $2020.$ As of the end of $2021,$ none of the principal on this debt had been repaid. Assume that the company's sales in $2020$ and $2021$ were the same. Which of the following statements must be CORRECT?

a$.$ The firm increased its short$-$term bank debt in $2021.$

b$.$ The firm had negative net income in $2020.$

c$.$ The firm issued new common stock in $2021.$

d$.$ The firm repurchased some common stock in $2021.$

e$.$ The firm issued long$-$term debt in $2021.$