Which of these represent opportunity costs? Select all that apply. Multiple select question. Building a new building on a vacant lot owned by the firm Using a piece of company equipment that has been sitting idle for two years in a new project The research and development costs related to a new project Using a current employee who is about to be laid off to run a project on a day by day basisWhat are the key differences between the free cash flows of a firm and those of a project? Select all that apply