单项选择题
A. Encrypt a file for secured electronic delivery.
B. Confirm the digital certificate to check file integrity.
C. Remove non-certified drivers from the driver cache.
D. Choose the level of driver certification to use when installing device drivers.
单项选择题 A technician is performing a memory upgrade by installing an additional 1GB stick of DDR RAM into a system. When the installation is complete, the computer shows 2GB of RAM at POST; however, it now indicates a lower speed setting for the memory. Which of the following is the MOST likely cause?（）
单项选择题 A user reports that they are unable to open any audio files. Yesterday, the user uninstalled third party music software. Which of the following is the MOST likely cause of the user’s error?（）
单项选择题 A technician is installing a memory upgrade for a remote user. The technician notes that the machine is not reporting the correct amount of memory that was installed during the POST step. Which of the following actions should the technician perform FIRST?（）