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CompTIA Server+ · CompTIA
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D. You don't have to be in the BIOS to update it. A BIOS can be flashed while logged into the OS. Even if you were trying to update it while in the BIOS and missed the prompt to enter the BIOS. The question states that you are at the OS login screen. The next logical course would be to either 1. restart the machine. 2. enter admin credentials, log in, and then restart. 3. Enter Admin credentials, log in, and update the firmware (BIOS) while logged into the OS.
B-Boot from Media is the correct answer Firmware updates (such as BIOS or the Unified Extensible Firmware Interface [UEFI]) may be required prior to installation, even for indirect reasons, such as network Preboot Execution Environment (PXE) boot, USB device boot support, and so on. If you plan on installing the hypervisor from a DVD or USB, you may also have to change the boot order configuration on your machine.