You decide to do some preventive maintenance on a computer system, including blowing out dust and dirt. When you perform the preventive maintenance, what should you also be doing? (Choose all that apply.)
A. Make sure the system has the newest security patches.
B. Replace all the cables.
C. Check for visual defects.
D. Replace the CMOS battery.
E. Check the conditions of the environment, such as space around the case for air flow and dripping water.