An organization plans to keep three of its cloud servers online for another nine months and a fourth server online for a year. The current pricing is $200 per month per server. The cloud provider announced the sale price of $1,500 per year per reserved instance.
Which of the following represents the cost savings by converting all four of the cloud servers to reserved instances?

A. $900
B. $1,800
C. $2,400
D. $3,600