Last year, you purchased land to build a retail store. You paid $20 million for the land. Another business has now offered $8 million for the land and that is the highest price your business should now be able to get for the land. Which of the following costs is relevant for your decision as to whether or not you should build a new retail store?a. $8 millionb. $12 millionc. $20 milliond. $28 million