last two questions have drop down answers in first pic, vis versa for second pic. thanks!

Mark is an engineer who has designed a telecommunications device. He is convinced that there is a big potential market for the device. Accordingly, he has decided to quit his present job and start a company to manufacture and market the device. Mark purchased a machine two years ago to make experimental boards. The machine will be used to manufacture the new board. The cost of this machine is: [Select] The cost of the raw materials that will be used in manufacturing the computer board is: [Select] Rent on the administrative office space is: [Select] Property taxes on the building that will be purchased to house the [Select ] manufacturing facility are: a period cost an opportunity cost a variable cost a product cost Mark purchased a machine two years ago to make experimental boards. The machine will be used to manufacture the new board. The cost of this machine is: [Select] a differential cost a sunk cost a period cost an opportunity cost Th will be used in manufacturing the computer board is: [Select)