Oriole T Corporation is comparing two different options. Oriole T currently uses Option $1,$ with revenues of $$69,000$ per year, maintenance expenses of $$5,300$ per year, and operating expenses of $$27,600$ per year. Option $2$ provides revenues of $$64,000$ per year, maintenance expenses of $$5,300$ per year, and operating expenses of $$23,300$ per year. Option $1$ employs a piece of equipment which was upgraded $2$ years ago at a cost of $$18,000.$ If Option $2$ is chosen, it will free up resources that will bring in an additional $$4,000$ of revenue. Complete the following table to show the change in income from choosing Option $2$ versus Option $1.$ Designate Sunk costs with an $"S"$ otherwise select $"$NA$".($Enter negative amounts using either a negative sign preceding the number e$.$g$.-45$ or parentheses e$.$g$.(45).)$

Revenues Option $1$

Maintenance

expenses

Operating

expenses

Equipment

upgrade

Opportunity cost