Company ABC adopt year-summary for decritiation of asset．They spent $17000 purchased one computer．It is eatimated that the computer can be sold with $2000 three years later。Thus，how much will be the asset decritiation of this computer in year three （）.

A．$5000

B．$4500

C．$7500

D．$2500

下列属于单位内部控制措施的有（　　）。

A．绩效考评控制

B．授权审批控制

C．复核控制

D．财产保护控制