What is the name of the electronic component that provides timing signals to the motherboard?

A user reports that every time their machine is powered on a prompt appears to save their settings for the BIOS and clock. Which of the following should the technician try FIRST?

A. Restore the BIOS to default settings B. Replace the CMOS battery C. Run a Windows Recovery Disk D. Replace the motherboard

The AES key expansion algorithm takes as input a four-word (16-byte) key and produces a linear array of __________ words (176 bytes).

Fill in the blank(s) with the appropriate word(s).