Which file is used to configure the various mounting options of a filesystem upon boot?
a. /etc/mount
b. /etc/fstab
c. /var/filesystem
d. /boot/config

B. /etc/fstab file.

Explanation:

The /var/filesystem file is a subdirectory of the root directory of a linux operating system, used to store files during the operation of a computer system.

The /boot/config file is  a file directory used to store system configuration parameters which can be accessed by the GPU before the installation of the ARM CPU and linux.

The /etc/mount (or /etc/mtab) and /etc/fstab are used to show the list of mounted volumes. The /etc/mtab gives details of already mounted volumes, but the /etc/fstab shows the list of possible volumes to be mounted upon the boot of the system.

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